Blizzard posted part 2 of their preview to the upcoming battlegrounds update:

Battlegrounds Preview Part II
A few weeks ago, we gave you a hint of what a Battlegrounds experience would be like, and also introduced you to some new concepts for player-versus-player combat, such as a slightly tweaked death system and capture-able graveyards. Now let's explore in greater detail how the battle for Alterac Valley can truly be won.
Click here to read more about the upcoming PvP Battlegrounds