Bethesda is officially done with Fallout 3 -- Mothership Zeta was the final downloadable episode for the post-apocalyptic RPG. So that means that they're switching back to the Elder Scrolls now, right? Maybe not.
"We are working on our next big game but we are not talking about it," Bethesda game director Todd Howard said during his QuakeCon 2009 keynote (via the Big Download).

But that game is not Elder Scrolls V. Howard said that there are "no current plans" for another game in that series.

So right now, it's hard to say what Bethesda's next project will be. Who knows, we may actually be in for an entirely new IP. Or we might be in for an Elder Scrolls MMO, of which Howard jokingly said "there's always a chance."

Life is just full of surprises.