A attendant at this years PAX East was quick to take a picture of all class background sheets. A really interesting read as it gives some inside to the class as well as the story behind each class. Off course this is not in game screen shots, so some of the pictures might be hard to read:
EDIT: apparently these Pictures comes from a focus test on leakerz.net. Check below comment.
Also here is some HD footage of (almost) the entire gameplay experience of SWTOR at PAX East 2011. :