Was just playing for about 20min before server went down. Looks like there are 2 zones: Warsong Gulch and Alterac Valley.
I ran to the gulch's entrance and was put into one of the 72 running instances of the zone, screenshots inc!
The battleground area, alliance base in background. Warsong is apparently the smaller of the 2 zones.
Horde base outside. Pretty bad SS, but I dont have anything else!
Me running with the flag!
In case you're wondering no I didn't make it out of that tunnel. It's great fun though, and my instance was just starting and had only 25 or so people in it. Near the flags there's a small spot you can run up to where you get a sprint buff, and make for the flag. You still get honor kills (lots of them and fast too) and it looks like bonus honor is being awarded for capturing the flag, etc.
Fun fun fun fun fun fun