Well, I thought that my last hope of posting HBP predictions and arguments disappeared when my computer gave up on me yesterday, although I knew, of course, that it was already too late, since all sorts of spoilers are (now) already out.
Still, these are only guesses on my part, and NOT spoilers - I've been careful not to even "look" at any spoilers so far - and they're mostly my wilder guesses: i.e. the ones most likely to be proved wrong! So please don't reply with any spoilers, if you "have" come across any!
Oddly enough, most of my curiosity is not about things like the identity of the Half-Blood Prince, but lies more in the direction of whether some of my wilder notions are right. Is Lucius Malfoy's wife Narcissa actually much more dangerous than she seems, for all her penchant for staying in the background until the present? The plot in Chamber of Secrets, with its clever use of intermediaries, so that nothing could be proved if it went wrong, seems more like "her" style to me than her husband's. She, after all, is the one whom Cornelius Fudge had never even met until the night of the Quidditch World Cup - whereas Lucius sounds rather more hands-on. He makes no secret at all of his beliefs, and is only too happy to try and face down Dumbledore in his own den.
Here's another thing I'm really curious about. Could the Quidditch World Cup in book four have been rigged? There are lots of clues, in retrospect, though they may be all coincidence. Because it's "odd" that Krum should choose to end the match, when there was "still" a chance of winning. In fact, he chose to end the match the very "moment" when it would no longer mean a victory for his own side. Well, we know that Krum is unusually susceptible to the Imperius Curse, and as for the Irish Seeker, Lynch, on both occasions when Harry sees him, his appearance (especially his eyes) matches exactly Crouch/Moody's description of the Imperius Curse only a few chapters later. And the Irish team as a whole work seamlessly together, as if they have a single mind or will. Is this a genuine case of the use of the Imperius curse in Quidditch? Is that the secret of the Irish team's success that season?
Not that Krum need have been under control. Now that I come to think of it, only "two" things would have been needed to make sure of the result. One is to keep "Lynch" under control, so that he didn't by some fluke catch the snitch first. The other is to have a "rogue snitch" - one that wouldn't even appear until 160 points had been scored: enough to ensure Ireland of victory.
And Narcissa Malfoy is there, all the time, in the top box, in perfect "line of sight" of them all - which seems to be how mental magic works. And judging by the way the former Death Eaters were celebrating a few pages later, they'd done rather well on their bets. Of course, she could also have been focusing on Cornelius Fudge, and possibly one or two of the Weasleys. Was she (or someone with similar gifts) in the crowd in the bookshop in Chamber of Secrets, making sure that when provoked by Lucius, Arthur would resort to violence?
And it's interesting that the twins were willing to bet their life savings on their results - right after seeing Lee Jordan too. It's almost as if they had heard something in advance. Lee Jordan is the Quidditch commentator at school - is his Dad a big wheel in national (or international) Quidditch, and in a position to know something? If there really had been some attempt at cheating on their own side, is that why the twins were willing to settle for their original money back from Bagman? And why George felt that it was very unwise for them to blackmail him?
Or am I just being too suspicious?
And I really do wonder whether, as Risti once suggested to me, the Griselda Marchbanks who turned up isn't entirely what she seems either. For someone who speaks loud (and oddly stupid) pro-Dumbledore things the moment she sees that she's in Harry's hearing, it seems very strange that Umbridge, who is apparently a bit in awe of her, should take out all Dumbledore's known allies among the staff while "Marchbanks" is still in the school. Umbridge had waited all this time. Couldn't she have waited one more day? Or is Marchbanks really what she seems, and was Umbridge doing it under her "supervision?"
Moreover, we know that legilimency and mental penetration does work by line-of-sight. Did the image planted in Harry's mind of Sirius Black being tortured really come directly from Voldemort? How would Voldemort have known exactly when Harry's potential allies at school would be removed, so that he'd have to go and rescue Sirius himself, unaided? Or was the image planted in his mind by someone a good deal nearer at hand? Given the way the desks were facing, the "only" person in Harry's line of sight at the time, was Griselda Marchbanks, again. And it would have made sense to have someone at the school, to make sure that Harry would have nowhere else to turn, before giving him the vision.
On the other hand, all this is rather odd behaviour for someone who had resigned from the Wizengamot in support of Dumbledore. Unless, of course, it "isn't" Griselda, but someone else, who has stolen her identity. In support of this, there's some indication that she hasn't been seeing her old friends and collegaues much lately, or not socially, at least. Professor Tofty only heard of Harry's Patronus charm from a "different" ex-member of the Wizengamot, Tiberius Ogden - not from his colleague at work, Griselda Marchbanks. And then there's Draco's odd assertion that Griselda had been seen at his home, when we know from Neville that she certainly "used" not to have any connection with the Malfoys. Also, it's just possible that Harry's reading of her hand in the exam was actually right, and the real Griselda really "did" meet her death last Tuesday.
If she "is" someone else in disguise, I think it's unlikely to be an example of the use of polyjuice, because she's not always drinking from a flask, like young Barty Crouch did. I would guess that the enemy has a Metamorphmagus on his side, and if such things run in families (as they're born, not made) my money would be on Narcissa.
And if the enemy really does have his own Metamorphmagus, whoever it is, then there really could be havoc. Anyone could be anyone. And if one of them takes the place of one of the twins for a bit, and twists their scarily irresponsible products just a little, there could be a catastrophe among the children who buy them. The twins will probably blame each other, and wizarding Britain as a whole will probably be out for Weasley blood!
And if the real Griselda is her friend, Mrs Longbottom might relax her guard when she shouldn't. Could Neville Longbottom be going home to a "little red riding hood" scenario, in which his "grandmother" is someone else? After all, the only way the enemy can "still" get the prophecy is by getting hold of one of the two people who were present when the glass broke, going into his memory (perhaps by draining it into a pensieve) and then reading the movement of Sybil's lips. The two who saw it were Neville and Harry, and it's pretty obvious that anyone would see Neville as by far the easier to catch! There was a sort of foreshadowing of this in the Prisoner of Azkaban film, actually, when the "grandmother" came out of the cupboard.
Was Sybil Trelawney's comment "is your grandmother well? ... I wouldn't be so sure..." a real prophecy, perhaps?
Another notion: do the seven potions in the sixth task in the Philosopher's Stone really represent the sixth book, and do they represent the seven Weasleys? Two of them are described as "twins."
Or am I reading too much into everything? Well, I'll find out in a couple of days.
Anyway, one last idea. I haven't read any spoilers yet, but with regard to the identity of the Half Blood Prince, I do note that only twice has there been any reference to a prince in the Harry Potter canon. A Chocolate Frog Card refers to Merlin as the "prince of enchanters", and Quirrel's turban is supposed to have come from an African wizard-prince. Of course, my hope is that there really is a remnant of the magical nobility, that various canon sources do suggest at least "used" to exist!
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Oh, here's yet "another" idea! It's not just Mrs Longbottom that would trust Professor Marchbanks - the goblins almost certainly do as well, given her longevity. Judging by the Chocolate Frog cards, one can get a fairly clear idea of usual wizarding lifespans in both the middle ages and the present day - and the only people with significantly longer lives either are friends of the Flamels (like Dumbledore - and he's a very powerful wizard in any case, that knows many secrets) or else they have something to do with goblins, whether they're a long time ally of goblin pressure groups (like the real Professor Marchbanks is), or at the opposite extreme, they're a serial killer of goblins, like the notorious Yardley Platt, who lived nearly twice as long as most fifteenth century wizards on Chocolate Frog Cards.
If someone else "was" impersonating her, and used their trust to steal their gold, or something like that, purportedly for the Order and Dumbledore's friends, before she disappeared... Can you "imagine" how furious the goblins would be? And would they believe any denials on the part of Voldemort's enemies. Could they somehow be manipulated into joining the enemy side, by some such manoever?
This would be potentially fatal, quite apart from the fact that they have their hands on everyone's gold, because there does seem to be a sort of "underworld" beneath wizarding Britain, in which goodness knows what monstrous creatures live (the sort of creatures the Basilisk lived on, and had possibly kept away from Hogwarts). Unlike the crust of the earth as we know it, these caverns get "colder" as you go down, like in Dante's inferno. The Vaults of Gringotts are in a corner of it well below London (and that network of caves has its own valleys and ravines and underground streams, its entrances guarded by dragons); but so, probably, are the caverns of the Chamber of Secrets, and the underground chambers too where Dumbledore had hidden the Philosopher's Stone.
And of course, if the Goblins do turn, I wouldn't like to be in "Bill's" shoes!
Well, I don't know how much of these speculations are near the mark (or if the whole lot are way out) but I am fairly sure that we'll see a lot more of this "underworld."
Oh, and I wonder if Yardley Platt "did" bake the goblins he killed in pies, as the secret of his longevity! Is there a grain of truth, deeply buried somewhere, in "all" the Quibbler's eccentric stories?
And one further thing I suspect. When Karkaroff mentioned to Victor Krum that he'd be telling Hermione where to find Durmstrang if he didn't look out, he wasn't "just" being paranoid. Victor had actually told Hermione quite a lot, reading between the lines. The combination of northerly altitude, mountains, forests and lakes does not actually exist in many places. Russia, for instance, is too flat. As far as I can make out, it narrows itself down to northern Sweden - the very place where (by some strange chance) the Lovegoods are taking their summer holiday, in seacrch of the Crumple-Horned Snorkack! And I think I recall that there "is" a Muggle legend of a "loch-ness-monster-type" creature in those parts, with horns as well, if I remember right.
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And I wonder if there's going to be any development of all the hints about space travel. And more on Ali Bashir and the flying carpets?
*Goes back to waiting for the book.*