The cake is a lie, but for DX11 you might still not use your PC's powers for a while lol. The switch from 9 to 11 will likely get you some resources back, to then spend on some sexier shadows and reflections.

Not my image but, love that ambient occlusion, lighting changes and the polished marble rock reflections:

Ready for that tessellation too.. <3

I'm also not a huge fan of invisible walls and there are a few walls in the 2.0 zones that drive me crazy, because they don't look like they should be and feel like they have no purpose but to be there.. I keep getting caught on one in particular XD.

Personally, I wonder how zone changes will work in Heavensward, we've seen there is a ceiling and assuming a floor to levels something that doesn't automatically load a zone changing map to fly to nearby sky zones.. So are there particular wind tunnels or your only way in and out is by an Aetheryte? Just curious.