Grass and other foliage does not deform when the player or mounted player walks through it with the DX11 Beta setting enabled.
Computer Specs (if relevant):
Windows 10 Pro 64-bit
AMD R9-3900X
64-GB ram
Nvidia GTX 1080 (Driver version 461.72)
GW2 version: 120008 (as seen in the bottom left of the Options menu)