There are a few trailers going around for something called “Battle : Los Angeles”. Judging by the trailers, that’s a must see in the cinema.
[youtube=http://www.youtube.com/watch?v=PKC_ORM0vpo]
Via Geeks Are Sexy, which has another trailer and a better one at that.
Trailers for Skyline were also promising. This one looks more promising though :)