So this video of Star Wars Battlefront II just got leaked online by EA's official twitter account and then got taken down, but not before some people managed to save a copy. I assume the game will be out in time for Episode 7's release. Unlike the last game, which only had content from the original trilogy plus Rogue One, it looks like they are including content from every era (i.e. the sequels and prequels as well as original trilogy). I'll update the embed with the official teaser when it is "officially" released.
EDIT: Updated with official trailer, but contains original teaser at the end.
