I'm still looking foward to this myself, there are several things that excite me about the game and the trailer for the Jedi class was pretty cool. I really like the idea of companions. One thing I heard in the Forum for example was the idea of having an apprentice as a companion for high-level characters. That would be so effing awesome.
And maybe it won't be a simple as damage class, tank class. It looked to me like they might be going for a buff/debuff angle instead. Which is a bit more tactical. IDK, wait and see I guess.