The second Battleground is going to be smaller. How much smaller? 30 vs 30? 20 vs 20?

From the size of the Alterac Valley Battleground, I'd guess that there will be multiple instances, and the server will assign us to a specific instance based on current Battleground participants. Will there be a way to play in the same Battleground as your friends? Find out more next time, when Blizzard relases more information.

While Alterac Valley is meant for 40 vs. 40, the second Battleground we're releasing is meant for smaller, faster play... it might appeal to you. ;)