AQctually not. There are only Bethesda games and they lack too much in quality. Even Obsidian, conceptual first-timers did better with FNV. Finally (let's hope) there will be a competition.If open world is what I think it is, we don't need another sandbox game, there are more than enough to go around as is.
... Which also brings up thoughts of the historical (not fantasy) open-world from Warhorse Studios (here's a video with unfinished and unpolished piece of land made for sake of showing level of graphics the are aiming for - http://www.youtube.com/watch?v=gwnSo9bcIyA)
The point of this post: open-world sandbox-ish RPGs may finally be well done games and not just almost-randomly-generated gambling shit with no story and choices in Bethesda style