Please stabilize sys-apps/portage-2.1.12.2. The most important change is that FEATURES=preserve-libs is enabled by default (see corresponding news item, discussed at http://thread.gmane.org/gmane.linux.gentoo.devel/86014). Bug 468524 tracks all bugs fixed since 2.1.11.62.
alpha stable
arm stable
amd64 stable
hppa stable
ia64 stable
ppc64 stable
ppc stable
s390 stable
sh stable
sparc stable
x86 stable
The next stable request is bug 478904.