Blizzard’s confirmed it’s working on a fifth, unannounced project, as you can see here.

“This brand-new game is not a World of Warcraft expansion, and it is not related to the Next-Gen MMO,” said a rep.

“In the present, the brand-new game is using the World of Warcraft engine merely for testing purposes.”

This new game is extra to World of Warcraft, Diablo III, StarCraft II and the company’s unnamed MMO.

http://www.vg247.com/2009/03/27/blizzard-confirms-work-on-fifth-game/

So would anyone like to speculate?  I love blizzard games!

"Could Blizzard be working on something for the Wii?
I don’t know what to make of this…so I’ll leave it up to you to decide.

Junction Point’s Warren Spector said, “I’d love to see what you guys do with the Wii,” to which Blizzard’s game design EVP Rob Pardo smiled and raised his eyebrows, but stayed silent.

I know we’ve heard about a few rumored projects from Blizzard on the Wii, but nothing really came to fruition. Should we take this as a slight hint that there is indeed something going on?

Also worth noting, Mr. Pardo praised Nintendo for trying something new with console controller inputs. More hope for future Blizzard support? Thanks to KevinN for the heads up!"

http://gonintendo.com/?p=77102
Hmmmmm... could it be?

do you know how kick ass this would be? considering that blizzard hasn't made any console games and if the first one is on Wii and knowing the quality of blizz games, zomg!

Of course Blizzard made consoles games, even Starcraft made it to Nintendo 64. I believe they had few for NES/SNES or so as well.

this gen =P

Nintendo could definitely be an option but are there not more PC's still than Wii consoles? I could see it if it was not Wii exclusive perhaps!

yeah we can only wait and see, I'm just waiting on D3 atm, don't know about SC2 for me right now though, can't spend too much money on games.

Diablo 3 is gonna be amazing!

i can see it as a xbox exclusive or a microsoft exclusive, i would love a starcraft for my xbox :)

Probably "Rock N' Roll Racing 2"

or "The Lost Vikings III"