What "Sneak Preview" set are you talking about Travis? Ep. 3? If so, they sure as hell didn't show or mention anything to that effect. Nothing new there at all, aside from the OTC packaging on the Falcon, X-Wing, Snowspeeder, and (I think) the Cantina. That was it. Their rep dressed as Slave Leia was pretty cool though!
Speaking of this new OTC packaging, I'm a little pissed now that I'm stuck with that current crappy packaging with the big, lame, ugly bright blue crap all over it, on those aforementioned sets. I'd much rather have the more attractive OTC packaging for my sets instead. I actually haven't opened my other ones, so I'm trying to figure out if there's a way I might just be able to exchange them when the new OTC sets come out...
But I just HATE the packaging design that's out at retail right now! Hmm...
Also, on a SDCC related note, they were (briefly) handing out more of the mini Lego Tie Fighters as their show freebie. They were in the little plastic bag. Didn't manage to snag any extras though. Sorry...
Lego continued to be mum on any new product though, either for the OT, or Ep. 3... Kinda annoying really. They're worse than Hasbro on spilling any new news (or maybe there just any new news to be spilt)...