You should be getting nag mails from buildsys about it already...
Please rebuild your libaries by the end of next week to make
sure we have working ghc in F12Alpha. With the newest macros
it should just require bumping release, adding a changelog,
committing and push to koji.
Actually good news! It seems we don't have to do anything
(modulo any build failures;) since fortunately there will be
a F12 MassRebuild next week apparently. :-)
So that is good news.
Jens