On a thread at
the Fantasy Flight Forums was a video from GenCon where they reportedly said that Wave 3 will hopefully be at retailers in 3 weeks.
I'm at work, so I can't take the time to watch that video to confirm that was said (grain of salt, etc.), but I figured I'd toss that out there.

NINJA EDIT: He says 3 weeks at about 4:45 at least. I would count a presentation by
FFG at a major con as fairly reliable, and really hope they hit their target.