Lol you guys are missing the point of a beta! You don't play to "play", you play to "test". Go and test it, so this MMO doesn't turn into another "beta launch" game like so many "next-gen MMO's" have as of late. Turn in bug reports whenever you see something, and be detailed about it. That's what the devs need.

That being said, play the other classes, or other faction, than the one you're planning on maining when the game launches. That's usually what I do in betas. I was actually surprised at how immersed I became in the Imperial Spy class story arc. Wasn't quite as immersed in the Jedi Knight story arc though, last weekend.