We don't know much. Here's what we know. Or, here's what we think we know:
There has been an awakening. Of the Force? Probably of the Force. It's in the title of the movie, after all.
There's a huge gathering of Stormtrooper-looking dudes.
The guy with the lowercase-T lightsaber is still around.
John Boyega's character Finn gets a lightsaber as well! It's blue!
Oh and people (and droids) are looking up at stuff.
!!!!!! STAR WARS !!!!!! STAR WARS IS BACK AND IT MIGHT BE GOOD? PLEASE?!!?!