I found this issue and found the solution. It seems that one of the databases, portage or eix, has changed format and eix will silently not read any new packages added by recent emerge --sync or layman -S.
The Fix:
emerge eix, do etc-update, then update-eix or eix-sync (eix-sync will run update-eix automagically and do a emerge --sync)
problem solved, eix will now function properly again.
At this time the most recent stable eix is 0.12.4, and testing (the one sabayon will default to) is 0.12.5
This solution has been tested on 3.4f x86 and x86_64 successfully.
~Az
