I personally expect to see Yagrum Bagarn in Dragonborn. If you recall he had corprus(Disease which allows you to live forever but you are in constant pain). So if he wasn't killed he could still be alive......................

He could be. That is if Fyr somehow knew about Red Mountain before it exploded, or managed to get to safety. And if he managed to bring anything with him. Personally, I don't think we will be seeing Bagarn, although I do think Fyr is a distinct possibility.

Aye, would be interesting to talk to him again, and maybe, just maybe he's finally gotten round to fixing those damned flying boots