Blue poster Vaneck announced on the European Forums that Alterac Valley would be undergoing some major gameplay changes in Patch 2.3.
In order to emphasize strategy more in AV, they are introducing the concept of "reinforcement count". Both teams will begin with a starting number of reinforcements which can be reduced in various amounts according to what is lost. A team loses when its reinforcement count is reduced to zero.
The death of Drek'Thar or Vanndar will still end the game, as all reinforcements will automatically be eliminated. Losing towers and Galvangar or Belinda will cause significant amounts of reinforcements to be lost. And staying alive will now be very important as player deaths will reduce the reinforcement count by one.
To quote Vaneck:
Defending your own teammates, towers, and key NPCs will be an important aspect of maintaining team resources and achieving victory in Alterac Valley.
More on the AV changes after the jump...