Just one statement, really:
WHY MUST I WAIT A WHOLE MONTH FOR THIS?!
That's really it.
I love the graphics upgrade, the change over with both the lightsaber change, and the gameplay mechanic for vehicle fights. I -love- the fact we can now land them and exit our ship and fight droids. I dunno about what I think will be a real-time strategy mode, but hey, it can't be all too bad right?
Force powers are MUCH better. I love the fact it works like the LEGO Harry Potter Wingadium Leviosa power, in that we can lift and move in multiple axes. The fact they also added The Force Unleashed-inspired force push is awesome, and lightsaber toss is a much welcome addition, especially after seeing it in LEGO Batman.
Oh wow, C-3PO finally has a purpose : O He's the archeologist/Hermione of Star Wars now, and in a much simpler method than the 3x3 box and the 2x2 box we had last. Now it's like Simon Says, only instead of more challenges, you get opened doors. Awesome.
I know this whole entry is really spoiler-laced as far as what to expect, especially if you planned to try the Demo. Trust me, this only touches base on SOME of what to expect in it.
I'm sold on the game, personally.