Pretty sure this is insignificant, but according to GameSpy, Diablo 3 is to be announced 2006.
http://pc.gamespy.com/pc/diablo-iii/
They also show StarCraft 2 on their TBA list.
http://www.gamespy.com/company/025/025125.html
Also, according to GameStats, they set the release date as 12/31/06. I think this just means that they think Blizzard will announce the game within that amount of time.
http://www.gamestats.com/objects/714/714955/
And as I said before, I'm pretty sure this is insignificant information, but you never know.