Studios Central is reporting a few celebrity guests (although still not confirmed by Disney). So far, this is what the celebrity lineup looks like:
Weekend 1 - Anthony Daniels (C3P0)
Weekend 2 - Anthony Daniels (C3P0O and Dee Bradley Baker (Clone Wars)
Weekend 3 - Ray Park (Darth Maul) and Jeremy Bullock (Boba Fett)
Weekend 4 - Ray Park (Darth Maul) and Peter Mayhew (Chewbacca) and Tom Kane (Clone Wars)
Here's the link:
http://sww.studioscentral.com/main/