“Obsidian is currently headed up by Chris Avellone, who was one of the major names behind Fallout 2.”
Obsidian seems to get the responsibility for many great sequels that they did not originally make (Kotor2, NWN2, Alpha Protocol (Mass Effectish) and now Fallout 3.5). So far, it has been obvious that each time their development is cut short and they are forced to release what feels like an unfinished, unoptimized, or unpolished product. A product that is still better than most other games, and screams the promise of a AAA title. Usually darker tales with decent writing. Here’s hoping they hit it out of the park with Fallout.
http://www.gamebizblog.com/gamebizblog/2009/04/new-fallout-game-due.html