What surprised me most was that Harrison Ford didn't make a cameo. Mark Hamill was great, Carrie Fisher's hair was different but Obi Wan was awesome!
Seriously...I saw Tron Legacy last night and it was SO heavy with Star Wars influences that I'm calling it Star Wars 7. We had Darth Vader addressing the Storm Troopers, the destruction of the Death Star, Luke flying the x-wing fighter, the power of the Force being used to save humanity...quite a few other references, too. Sam is really a Han Solo/Luke amalgamation, but you get the idea. I wasn't looking for all this, it just hit me as I was watching. My son (17) claims the movie is an homage to the '80s but I'm not buying it. LOL.