I find it funny to see people get so absolute about TES lore, saying this or that is impossible (the dragons were gone right?)... The lore is not absolute, Bethesda can change what they want when they want to suit their story telling needs. That's one of the reasons why they set up the lore to be written from the perspective of entities within the universe itself; so it can be truth or subject to mistakes, or misinterpretations, tampering, lies etc. I think its an great way to approach making lore as it allows for changing or adding of details here and there without being too limited by preexisteing concrete laws or the need to retcon everything all the time.
Anyway on topic

I think there is a high probability there will be something to do with the thalmor as the MQ seemed to be hinting in that direction... i am not apposed to this at all, i wana kick their asses...

I think id like to see an expansion of the falmer, at least making them less goblin like perhaps there are less twisted versions deeper underground, or maybe they organize an attack on the surface trying to reclaim it. Id like anything to do with the dwemer, and i dont care how many people think they are over done, i really like the steampunk aspect they bring... We know that at least 1 dwemer survived their extinction, maybe another could in another way such as being soultrapped and placed into a machine/construct or anything weird like that

OR not im not too fussed, but i do like them heh.
Another thing i think may happen is that the Dragaonborn will need to gather up the support (by battling or questing for them) from different dragons for an up and coming threat, perhaps building an army to battle with, and id love a shout which would allow you to transform into a dragon temporally.... or at least let me fly around a little heh

(maybe thats stupid i dunno).