Please stablize sys-apps/portage-2.1.6.7 (bug 254662 tracks bugs fixed since 2.1.6.4). You'll also have to stablize app-portage/genlop-0.30.8-r2 (bug 259360 blocks this one) due to bug 254972.
Stable for HPPA.
alpha/arm/ia64/s390/sh/sparc/x86 stable
stable on ppc64
ppc stable
amd64 stable.
m68k stable, thanks to kolla for testing, closing