Magicka is out soon. It's an indie Diablo clone, but with a nice little twist in that the only class is Mage. The main attraction is its magic system, based around eight elements that can be combined in spells by pressing them in quick succession.
It's basically a cross between Doodle God and Diablo, for people with quick fingers on the keyboard. Also, multiplayer.
The other draw is its sense of humour, which rips on every game, meme and fantasy fiction to come before it.
Look at the achievements.
Obligatory trailer. Nothing flashy, but you get the idea.
Something to tide you over until
Diablo III.