You are missing emovix in IUSE. Other thing is, _preX > betaX (looks like upstream needs a better clue... :P) Please remove the _pre versions, people will get the older _pre releases instead of the latest _beta otherwise. (masterdriverz already fixed package.mask, _beta1 got unmasked because of the bad upstream versioning).
IUSE fixed, I'll leave it up to deathwing to sort out versioning issues.
I overlooked at this one. I'll sort it out soon enough. Thanks for that :)
Fixed in CVS. Thanks for reporting the issue.