The latest Bethesda Blog is an interview with Matt Firor, the head for Zenimax Online Studios, a new division of Zenimax, the parent company of Bethesda. The official press release doesn't mention any specific titles or whether the MMO will be Elder Scrolls based or not.
I see! Though one thing is certain: We won't have as much freedom as in the elder scrolls games. Since we all know what will happen then.
Well yeah thats understandable since people want uniqueness and not just the traditional RPG's in they're MMO's. Though there are getting quite a few. There isn't really much variety to choose from when making an MMO anyway, They tried MMORTS and failed.
Maybe this game might very well be designed like the elder scrolls series. Though there seems to be speculation that Fallout 3 could be what they're talking about.