Earlier today Blizzard had a media press in Korea. Below are some leaked footage of Warlords of Draenor.
Holinka at Korea
What is Ashran? Similarities to Alterac Valley?
PvP Designer Holinka was also at Korea; you can find a Korean article written about the interview here. Holinka talks about several important new PvP aspects such as the new Critical Damage Change lowering from 200%->150%.