Drakensang Online is the latest such game in development heading for a release, with the closed beta having just begun. If you've never heard of the game before now, don't fret -- applications for testers are still being accepted.
How much social interaction will be present in the game remains to be seen, although the game's page boasts that players can engage in battle with and against other players around the world. There's a definite Diablo vibe to the screenshots and the trailers, so if that's up your alley, it might well be worth taking a look at the game during its beta testing phase.
[Thanks to B1GG1N for the tip!]