I know it's too late to change what they've already been doing, but I think it would be absolutely AMAZING if TES V used the Project Offset game engine. I don't know if this would be a great open-world engine, but the graphics would be absolutely stunning if gamesas could pull it off.
Here's a video of Project Offset for those who don't know what that is.
http://www.youtube.com/watch?v=rkoi6WCCJHY&feature=related
Project Offset was canceled months ago and the engine was built to support a technology which was canceled, I don't see anyone using this engine in the future unless it's ripped up and put back together.
There are other active threads about the engine, please use one of them.