Here is a list of confirmed Twilight Saga Cast Comic-Con attendees. Please remember that these confirmations are made with the stipulation that the cast member will be there barring any scheduling conflicts so things may change.
Robert Pattinson: confirmed via a phone call to his management by Spunk-Ransom.com.
Taylor Lautner: confirmed via Taylor’s publicist by TaylorLauterDaily.com.
Rachelle Lefevere: confirmed via her Twitter account.
Billy Burke: confirmed via his Twitter account
Jamie Campbell Bower: confirmed to attend AMC’s panel for The Prisoner but no word on the New Moon panel.
E! Online is hinting that Kristen Stewart will be there but there has been no confirmation of this.