Zarhym chimed in on one of these threads a couple days ago, and while he mostly told people they'd have to wait and see, one reply he did give suggests a sneak peek into what the battleground could be: "If "conquest" means the ability to catapult or parachute players behind enemy lines, then yes."
Ok, so it's not much, but it's there. There will be Catapults, and we will be flinging players in them! I know one of my favorite things to do in Alterac Valley back when it lasted hours was to sneak behind enemy lines to capture objectives or gather Frostwolf Hides and the like. Of course, I could do this because I played a stealthing Druid. Non-stealthers generally did not have the ability to sneak past all the PCs and NPCs blocking their way. But the idea of sending paratrooping special forces in to complete small objectives or even just flank the enemy is just plain sort of cool, if it ends up working out like that.
Beyond that, Zarhym also hinted that the Battleground revamp is coming along, but of course, once again, he had no information to offer. Will we see it in Patch 3.2? Hopefully, the PTR will come up soon and we'll know more for sure.