It must be old news to a lot of you (it's dated the 03/10), but for those interested and did not know yet. At Gamespot, you will find 6 pages of info on battleground concerning 2 civs, the Empire and the rebels.
www.gamespot.com/gamespot/stories/previews/0,10869,2816242,00.html)
NO need to point out if it's old news for you :D