John Klensin wrote:

The WG decided to shift the registration model for Service Extensions
from "Standards Track or IESG-approved Experimental" to
"Specification Required". No decisions have been made yet about
other mail-related registries established by this document in
Section 8.1. They will be left unchanged, and this item closed
unless other decisions are made, presumably before IETF 115.
Probably ready to close.