Speaking from a PvP perspective, I wouldn't mind seeing a new weapon/skill line. But a new class...no, not really. Any new class would quickly become P2W like Warden and Necro were (and, arguably, still are).

I'd like to see a tinker/engineer class that uses dwemer technology or technology from Clockwork City/Sotha Sil.
I feel we need new weapons, especially a new magicka weapon but I also desire another class to play.
I'd personally like for ESO to take on New World by adding some form of arquebuss. I really miss playing my Tinker in Warhammer and Engineer in GW2 (but overall I dislike GW2)
I'd like to see a tinker/engineer class that uses dwemer technology or technology from Clockwork City/Sotha Sil.
I feel we need new weapons, especially a new magicka weapon but I also desire another class to play.
I'd personally like for ESO to take on New World by adding some form of arquebuss. I really miss playing my Tinker in Warhammer and Engineer in GW2 (but overall I dislike GW2)
Engineer/Tinkerer/Artificer, and tie it in to clockwork or something.
We probably won't get anything new though, no skill lines. Once again console is holding us back because of memory limits.
It's either just passives or something like the Psijic skill line, which is basically reused animations with new light FX.