In an expanded answer to the news of cross-battlegroup battlegrounds, we now hear from Kalgan (aka Tom Chilton, lead game designer) that there will also be an option to enter a "war games" style of play. What does that mean, you may ask? Well, here's the answer from the floating lich-head's hands themselves. (That's the icon he uses.)
If Mr. Chilton's statement here actually comes to pass, this seems like a really cool option to make BGs useful for more than just queuing for points against faceless Horde or Alliance. Now, you would be able to go into a BG against people you know, do fights against the same faction and have mass tournaments organized solely by players. A fairly elegant answer to the "cross-battlegroup BGs will dilute community even more" statements that have been coming out.