Are there any Dungeons within the world you wish to return to?
(Hard) (Savage) or even one from 1.0

Personally for me it would be:

The Thousand Maws of Toto-Rak -
I wanna know (and fight) the beast it's named after..

Dzermael Darkhold -

I wanna find out what happened to the place once we cleared out the voidsent. Apparently there was a portal to the void but I don't recall actually closing it. Just defeating a big voidsent.

Aurum Vale - just because having the joke "Aurum Vale Hard when?" Come true would be fun. Also a morbol mount drop would be nice.