In case you haven't noticed, since Monday there was a teaser image hosted on the main Blizzard site: http://www.blizzard.com/us/splash.ht...C8F3A.app05_01
As you see there is a picture of ice being melted with a face in the center and glowing runes, right now this is stage 6 of the picture.
These are all the stages so far:
You may also notice small runes on the sides, right now there are five runes. The one on the top left is a rune found on the Frostmourne sword from Warcraft III, the one on the top right is the Hel rune from Diablo II, the bottom left is the Protoss symbol from Starcraft II, the bottom right is an unknown ruin, the top middle one is a snow flake which is an obvious reference to Blizzard. There is also a sixth rune, but it isn't glowing like the others, you'll find this on the top right corner. Tomorrow the image will update again and we'll probably see who that face belongs to. Also tomorrow is WWI Paris 2008 where Blizzard will give details about the new WoW expansion and Starcraft II, as well as a mystery announcement. This is a two day event and Sunday happens to be... the anniversary of the announcement of Diablo II... :o
Oh yeah there is one more thing, on DiabloII.net they have inside sources that say... Diablo III WILL be announced!!! You can find that here:
EDIT: DIABLO III OFFICIALLY ANNOUNCED!!!!!!!!!!!! What? No one on the Anime Forum cares about Diablo?