What I'd like is for them to do the borders Morrowind style, and no, I'm not just saying that because I'm a Morrowind fanatic, they had a great idea back then. For those of you who don't know, when you came close to the border of the map in Morrowind, the game would enter an endless loop. You would continue moving forwards, but never actually go anywhere on the map. This was easier in Morrownd, because the game was surrounded by water, but I think it would still work very well. All of the grass and terrain has been generated semi-randomly since Oblivion, so just have the landscape endlessly loop, randomly generating new terrain, as you get close to the border.
Thoughts?