Although a WoW expansion on Draenor would be great, the name just won't do it for me; it doesn't seem "right" for a WoW expansion.
The name would make much more sense as an expansion for Hearthstone, similar to its current name "Heroes of Warcraft". Imagine in it for a second - Hearthstone: Warlords of Draenor. The problem is that Hearthstone hasn't even been released yet and it's way too early to trademark an expansion for it. Maybe Blizzard is trying to put us off? We'll have our answer in a week...