As was the case with prior games, the programming side will be focused on patching for a while, and the designer side will work on DLC. After a few months, THEN the next project will begin; my bet, again barring Obsidian, etc. getting to do it, will be
Fallout 4.
What I'd really like to see, though, is a new
Elder Scrolls Adventures game. It's been 13 years, after all!