The current stable is quite outdated, and I just made the conversion to new distutils-r1 eclass, so let's mark the latest version stable please.
amd64 stable
You should probably go with 1.3.2 though. See bug #538448 Otherwise I agree it is badly outdated and misses a lot of new MuscBrainz features.
x86 stable
media-sound/picard/picard-1.3.1.ebuild: DEPEND: ppc(default/linux/powerpc/ppc32/13.0) ['>=media-libs/chromaprint-1.0[tools]']
moved to ~ppc