Folks in the PC mod community should be jumping for joy, as it seems that StarHack Beta is now available on Battle.net. In North America, at least.
StarHack is a hack-and slash conversion for Starcraft 2, that uses Diablo's battle system, mechanics, and a lot of it's menus. Basically, it takes Diablo's focused depth, and places it into Starcraft 2's overall experience.
For right now, StarHack Beta still has it's debug features out in the open, and the single-player campaign is not quite finished. Obviously, they're looking for your feedback, and the game looks awesome so far.