It's fun but short. Walkin around smackin troopers around with lighting, a lightsaber, force push, and other troopers is fun.
I played on the sith lord difficulty - the hardest unlocked difficulty - and could have run through the thing in less then 10 minutes if I weren't screwing around with the physics and what not 
The demo takes place in the TIE fighter factory, and yes - you can grab the TIE fighters off the racks. A little ways further in, you can see some fighters in action, but I never managed to grab them - might just be me though. At the end of the demo you rip a 2legged walker - AT-ST? I can never get it right - in half in one of those GoW style quick time events, so thats a good thing, imo. My only real problem was the camera, and the controls - the latter because I though I was play Psi-ops half the time, the former because I kept thinking R1 was reset camera...
The game seems aimed at 'fun' for the moment, but that may change once the enemies are a bit more competent then your run of the mill Stormtroopers