No big news. But as Gentoo may be the first user of commit signing feature and the repository has a special shallow and wide tree structure, it may be interesting to watch how it works out:
http://thread.gmane.org/gmane.linux.gentoo.devel/77537 http://thread.gmane.org/gmane.linux.gentoo.devel/77542 http://thread.gmane.org/gmane.linux.gentoo.devel/77193 (loong and probably not technically interesting)
-- Duy