After pouring over the manual and related information, it appears there are at least two new X configuration options: AllowUnofficialGLXProtocol and PanAllDisplays. The AllowUnofficialGLXProtocol option will expose the GLX protocol on GL commands where the protocol is incomplete. The PanAllDisplays option will enable panning on all displays as the cursor is moved. Testing has also revealed that there are some VDPAU improvements.
The NVIDIA 185.13 driver is available for Linux x86 and Linux x86_64.