Do you think there are going to be remnants of the followers of the Tribunal (Since Vivec is most likely dead, there is nothing to worship), or will the Dunmer have turned back to worshipping Daedra?
I have a feeling they'll be way too disenfranchised by the Tribunal and the princes, due to the Oblivion Crisis and the Red Year. Likely, they'll follow what the nords do, or go back to ancestor worship. I have a feeling it'll be much more of the latter and less of the former. Also, [censored] the Imperial Cult! It's more 9 [censored] that I don't want to see or hear about.
Have the refugess become a part of Skyrim's identity, after 200 years?
We'll have to play the game, won't we? Honestly, a very small part. Currently, there is only one town of only dunmer in Skyrim. Likely to most nords, they're likely still refugees. Also, you have to remember that mer breed slowly. Where as humans, and most likely orsimer, can breed like bunnies, relatively.
What do you think the remnants of House Telvanni are up to, because from my understanding, they went east and were relatively unaffected by the Argonian invasion?
Dead, nonexistent, or still cooped up in their towers when no one else is around. Also, they have always lived east. Living in east Morrowind was not a response to the argonians.