A quick reminder of what Draenor looked like in Warcraft 2 (before it was shattered and become Outland):
http://www.gamershell.com/static/scr...48666_full.jpg <- this is Hellfire/Tanaan 100%
Also notice the red sky: https://www.youtube.com/watch?v=ki3y2-XI0bY (It's not called "red world" for nothing.)
Karabor/BT is also different even in earlier WoW (pre-shattering view of Karabor: https://www.youtube.com/watch?v=K6-C-_PJTa4 )
Yes, there is SOME green space where Terokkar should be, but notice a few things. Virtually none of the zones in WoD Draenor look like War2 Draenor. There are no vast forests of giant mushrooms, no green water, no black rocky mountains or any of that really.