With all the banter about Karesh I have another idea to rally against.
Thrall on the Blizzcon Poster. His home?
Outland.
Ecodome Models. Where did we see em last?
Outland.
Worst performing Classic Realms? Burning Crusade, home of
Outland.
Dying for a remake but not nearly as difficult as the Classic Zones?
Outland.
Just a pitch, but Iridikron made a dark bargain with a void being known as the harbinger. This being is ushering it's masters to us. We know from the Old God's they still have to travel through the nether.
So what if Iridikron teams up with the Harbinger to attempt to bring the void lords to Azeroth and in order to do that they do what the Burning Legion did, Invade through a world closer to their own to get to us sooner. They Invade Outland to make use of the Dark Portal.
Edit: Add to this. You could even have it be that they used the remnants of Karesh, a moonlike wasteland, to pull Outland to them so we have new zones to explore and places to see.
Double Edit: Lordy imagine the scenes from Argus, Macaree, specifically, or whatever it's called now, with the ruined world floating in the sky box, but imagine Outland just shaped like that. The horizon bending towards you with Zangarmarsh visible arching it's way towards the portal slightly.
Triple Edit: Context for the Double Edit.
