Actually, FileVault was modified, if only slightly in 10.3.1.
Everyone just needs to relax -- 10.3.2 will come when Apple is ready to release it. Some people want it now, some people want it perfect, neither will get their wish, but it will make substantial fixes for the majority of users.
10.3.1 was not a conspiracy update - it was just an initial fix designed to address the most serious problems encountered by the public, most of which involved data loss.
If you're upset about your nVIDIA or ATI drivers, even for OEM cards, write to Apple, sure, but also hound nVIDIA and ATI.
As for the release date - it seems, according to the reports on this site, that the builds are tightening up, and coming closer and closer together, timewise. Infer what you will.