My first thought upon seeing this: "I'm going to shoot Abrams."
It took me a second watch to realize what was bothering me about the Falcon (my second-favorite Star Wars vehicle, and I'm a vehiclephobe; screw lightsaber fights) - it's missing the flanges over the the engine in the rear. I'm also betting that the square "radar dish" was because it was replaced after Lando got it knocked off in the Death Star II.
I like the new stormtrooper look, and I'm a little shocked we're seeing classic Tie Fighters. The "claymore" lightsaber was interesting.
I laughed when I saw the heroine on the jetbike - while it looks like a scavenged pod racer with a seat, it also looks like a big ...erm - well, y'know.
But strangely, the thing that bothered me the most was X-wings flying about 3 meters above the ground like snow speeders. They aren't snow speeders. They're space craft. Fly 'em low, but that was silly. I kept expecting one of the laser cannons to catch on some water and flip it into the ocean. (Yes, I know they have repulsors two. But by tradition they fly like WW2 fighter planes. You don't fly those low to the ground. If they wanted to fly them that low, they should have used speeders for that scene, not X-wings.)
I don't even want to talk about the replacement for R2.
This movie better have an awesome space fight. I'm expecting something on the grand scale of the Death Star trench or over Endor. Movies 1-3 had pathetic space battles (though Revenge had some potential, just didn't carry through).