Authors Jim Butcher and Mercedes Lackey both played City of Heroes, so I'm sure there are several celebrities that will be playing SWTOR (it's Star Wars after all!), but yeah - I doubt they'll ever come forward.
Maybe someone in the NCIS cast plays it, since they joked about McGee playing SWTOR at some point on the show (the episode with the MMO developers that were being killed).
not only did Mercedes Lackey play City of heroes, but she also got them to let her write one of the modules AND was one of the staunchest fighters against the game's shutdown. as if I needed any more reasons to adore her :P