is a Star Wars
Total Conversion for Battlefield 2142
which replaces all content, down to rocks and other scenery, with new material. It currently features 5 maps, 2 factions (Empire and Rebels), and a handful of vehicles. It also introduces space combat, which is boring at first but really gets fun once you know what you're doing and not just flying about shooting random X-Wings. It's also a bit thin on the ground vehicle-wise, with only three infantry-only maps so far - the AT-ST is the only combat vehicle. I'm sure this'll change soon enough, though.
Looks like a certain movie scene, this.
TIE Interceptor about to be shot to pieces.