Yeah, Stealth Rock happens before abilities activate. That's why Drought won't activate if Mega Charizard Y dies to Stealth Rock. And yeah, I've seen the demo dumps for myself, and I've been reading all the discussion about it on Smogon's forums.
According to the dumps, we should have all the same tutors from BW2, so any moves that could be tutored in Gen 5 should be teachable in ORAS (except Bug Bite on the Bellsprout line for some reason). I wish they'd bring back Sucker Punch as a tutor though, because Shiftry could always use a nice physical Dark STAB that isn't Feint Attack.