What if Iron horde Draenor was like Timeless isle.
Timeless isle is on our timeline. We don't need to go through time or anything!
What if Iron horde Draenor was just a copy of the 30old draenor, "pasted" in our universe, like a new planet in our world! That would mean that Gul'dan was on skype with our Kil'jaden, and there were NOT two Burning legions or two Azeroth. Only two dreanors.
I don't think they said anything aginst this at blizzcon.