Stuart Herbert | Gentoo

The arch teams have been busy, marking baselayout 1.12 as stable. Unfortunately, I can’t point you at the release announcement, or an upgrade guide, as neither has been published

This release is not 100% backwards compatible. It’s expected to work for most folks, but there has been the odd problem here and there. Before upgrading, please check this tracker bug first to see the current state of things. If you come across any new problems, please add them to that bug.

And it goes without saying that, if you run Gentoo in a production environment, you should first test any upgrade (especially one like this!) on a test box first.