I'd hope for 2-3 decently sized expansions, with at least 12+ hours of gameplay each.

If they do decide to do dlc, I'd expect 3-5 here and there.. things such as new player homes, items, followers, etc.

The 2 previous games had 2... So i will say 2

I'll put my estimate at aorund 5 or 6 DLC, one or two full expansions, like Knights of the Nine or Shivering Isles.

I'd say only 2. At the rate their progress is going(regarding news and updates, etc...) I think DLC/Expansions for Skyrim are on the backburner for now.

More likely is that there working on each DLC longer.