Well, that was fast. Bethesda has just announced a new Fallout game, titled Fallout: New Vegas, at its London showcase today.

The game will be in the same style as Fallout 3, an open world RPG. Fallout: New Vegas is currently set for a 2010 release for PC, 360, and PS3, and is currently being developed by Obsidian Entertainment.

The choice of developer, Obsidian Entertainment, is an interesting move by Bethesda to make. Obsidian Entertainment is made up of a number of staff from the now defunct Black Isle Studios, who were heavily involved in the development of the first two Fallout games.

This is going to be one to watch. We’ll keep you updated.