Starcraftwire.net translated a German players post who claims to have inside knowledge of the Starcraft 2 Beta. The breakdown is as follows:

We have translated the German fan's summary of the StarCraft 2 info summary:

* Blizzard has a fixed date for the beta, however, it's still a secret.
* The multiplayer part of the game is basically done, except for a few details.
* There will be several opportunities to participate in the beta to come (including competitions, perhaps a kind of story competition or similar).
* In the current build (internally at Blizzard), there is a Dark Pylon with a cool ability, which enables Probes to harvest faster within the reach of the Pylon.
* The Command Center can now use a new cool ability that creates a "bigger" SCV which is better at harvesting.
* Supply depots can be upgraded to give +2 Supply.
* Xordiah, who is a "Protoss Fetishist", is Very Happy.
* This build's Immortals are extremely strong.

The full story can be found Here