According to tweets made by several former Obsidian employees, the company went through a round of layoffs yesterday. VG24/7 initially took note of the tweets, which have also been posted in the company's forums. The extent of the layoffs are not known currently, and Obsidian has yet to respond to requests for comment.
Obsidian is preparing to ship Dungeon Siege 3 at the moment, having just come off a year with the highlight of Fallout: New Vegas and the fizzling of its original IP, Alpha Protocol. We'll update as more information becomes available.