What's all the Blizzard hubbub - UPDATE DIABLO 3!!!

As you may know, for the past week Blizzard Entertainment has been teasing its fans with a splash screen on its main sight. The image is overlapping ice crystals that cut across the whole page. Each day it has gradually changed in many ways like adding runes that depict images or relics from all their different games as well as cracking open revealing glowing eyes. Many many people have speculated it could be so many different things from Diablo 3 announcement to release announcements for Wrath of the Lich King and many other things (Lost Vikings, World of Starcraft). I would like to throw out my list of ideas before they announce what it is, just to see if I guessed right.

What I think it might be:

1. Xel'Naga embedded in the story of Starcraft 2, possibly playable -
   The Xels are the people who empowered (some say created) the protoss and the zerg. They are a god-like species with powers of the supernatural and spiritual.
   In the novel Shadow of the Xel'Naga, the three main species fight for control of a large Xel'Naga artifact on the planet Bhekar Ro, but accidentally activate it. The artifact releases a creature incubating in the structure, which proceeds to convert the nearby Xel'Naga–empowered Protoss and Zerg forces into energy for nourishment, before disappearing into space. It could be this or possibly the Xel'Naga that are still alive.
2. Diablo 3 - Although Blizzard North, the creators of the original Diablo games, has mostly disbanded and formed Flagship Studios I believe there is plenty of backing behind this game. One of my friends is a super fan of the series and would probably sell his soul for this game to come true. I would surely sell something for a copy.
3. A new franchise in the Blizzard family - its been nearly a decade since they have created an original world and story for a game. Don't get me wrong, I love the worlds they have created, but I would love to see what else they have cooking.

What I want it to be:

1. World of Starcraft - To be honest I liked Starcraft's world and story a little bit more than Warcraft's. I also believe that the story has much more potential and can expand much more than Warcraft's can, each race having winding stories. I would be great to have 3 unique factions each with their own unit types running around and hunting other players. Since they have an already great MMO platform to build it on, they can easily create the same thing with the Starcraft world.
2. Diablo 3 - I have to be honest, the second game and its sequel leached quite a lot of time from my life (like World of Warcraft before it was out). It was an easy to pick up game but also had elements that made it appealing for the hardcore players. Farming for gear and in-turn selling it for a profit (better item usually) made you feel like you were really doing business. The game had such tight controls and easy to play style that made it extremely hard to put down.
3. A new Warcraft (RTS) Game - I know it's a bit early to start talking about another RTS coming from Blizzard seeing as SC2 is not even close to leaving their doors, but a man can dream. I have always loved the different gameplay systems SC and WC have had. They are extremely different games but I really like them both quite a lot. I would like for them to continue the story of the Warcraft Universe outside of the MMO. The MMO story and environment never seem to give you that same connection and it feels quite lackluster.

Can't wait to see what it turns out to be!

UPDATE: It has been confirmed to be Diablo 3!!!