Okay, saw the trailer just today and: Iam very much pleased so far to see: We will still have Stormtroopers, Tie-Fighters, probably Star Destroyers etc.
This means the Empire either isn't dead (most likely) or the New Republic has started to use (like in the prequels) the materials left from the Empire after its downfall (less likely to me, but who knows? well, maybe some diehard-fans can clear that already to me)
So I am intrigued, even if most of the EU will be thrown overboard, if they will keep certain cool aspects and make use of that. For example that the Galaxy is still kinda divided, the Republic still struggling to become stable while the Remnant Empire is resisting in getting completly wiped out. That would be awesome. Hey, and if they even introduce their military is led by a blue-skinned tactical and military genius? Ah, might be asked too much though 
I think 10 years after the battle of Endor, "Imperial Remnants" were still kicking rebels ass. Jedi Knight anyone?
I don't think the generality of this history is changed too much in this movie.
I couldn't care less if the storm trooper was black, white, orange or pink with yellow stripes. The trailer looks freakin' epic. The only thing that really p*sses me off is that I have to wait a whole damn year to see the f*ing film! D:
Also, that lightsaber looks awesome. Reminds me of swtor's energized conqueror's lightsaber.

One does not simply change Lightsaber's look and sound which we were living with for more than 15 years at least (and turn it into a horrible Long FireSword).
pic changed, cuz too melodrama.