I put together the 1.21.0rc1 this afternoon. I'll announce it shortly,
but, first, some observations.
* When you add or remove a configuration variable, it should have
release notes. When you update the release notes, please make sure that
you also update MW.o. A number of variables are mentioned in the
release notes that don't have a corresponding page on MW.o. The
following configuration variables are the currently redlinked on
<https://www.mediawiki.org/wiki/Release_notes/1.21>. If you can update
their on-wiki documentation, I (and I'm sure others) would appreciate it.
* Should the breaking changes be consolidated to a single section of the
release notes? Right now, they are in three different sections. I
think they should be moved to the top of their section at the very least
(I did this on-wiki).
* There remains one pending change that is not in the 1.21 release
candidate -- "Password Recovery system uses Tokens" -- because it hasn't
been merged into core yet. This change will probably have to wait until
1.22, but I'll leave it on https://www.mediawiki.org/wiki/MediaWiki_1.21
[We are] immortal ... because [we have] a soul, a spirit capable of
compassion and sacrifice and endurance.
-- William Faulker, Nobel Prize acceptance speech