This was probably the most underwhelming part of the conference. Blizzard walks on stage and I think "Blizzard Bomb!" and we get...an old game. Everyone that wants it has it. It's like Mass Effect 3 for Wii U.
I think the exclusive partnership was more than anything else. A long time ago people were claiming the WiiU was going to get WoW. That doesn't really seem possible now.
Diablo 3 was definitely underwhelming though. But nowhere near as bad as the "Hey. this is a tech demo and an announcement of an announcement that we'll announce later about final fantasy" that we got from Square Enix.