Most of it is being saved for Celebration.
Yeah, I wouldn't count on that. Hasbro, and other companies, consider (rightfully so) SDCC the pinnacle of geek and save a lot of news for that event, even at the loss for an event like Celebration. I always assumed that a dedicated Star Wars event would be better to unveil stuff, or save the cool exclusive for, but we've seen before that that's not necessarily the case.
I would assume that by the time both SDCC and CV arrive we will have seen leaks for most of the product they've been saving for the shows. Like Jabba, according to Hasbro, was for a CV showing, but we've seen in-hand pics already. They may be able to spring a couple exclusive items on us (although, not the Slave I now) and maybe a figure or two, but mostly the reveals will be less exciting than most people want.
The slideshow presentations that Hasbro should have for both events may have some news for 2011 product that we haven't seen, but I would expect we'll know about or have seen most everything they physically bring to SDCC and CV.