Please test and stabilize =gnome-base/gnome-control-center-3.14.5-r1 for amd64 x86 It's needed for compatibility with >=sys-libs/timezone-data-2015f (3.14.5 fails with 2015f thanks to the new North Korea time zone.) See bug #557628
Also please test and stabilize =gnome-extra/cinnamon-control-center-2.4.2-r3 for amd64 x86 Identical issue there (bug #559052).
amd64 stable
x86 stable. Closing.