I personally would love to see more varied zones, rather than having 1 specific landscape for each one.
Examples: Having a mountain range in part of New Black Shroud, having a lush oasis type of jungle area somewhere in Thanalan. I know there are small bits of this in the current version, but I would love to see bigger parts with these.

Just imagine traversing the Black Shroud's region bordering Coerthas, it could be a mix of steep mountains with breathtaking views of the jungle around it. I want zones I can actually get lost in and have them feel like a real wide and open expansive region.