NVIDIA shipped the 340.17 beta display driver this morning as their first public release in the 340.xx series. The main feature with this new driver is initial support for G-SYNC monitors, NVIDIA's preferred method for having an adaptive/dynamic monitor refresh rate for reducing tearing, etc. G-SYNC requires special hardware support and goes head-to-head against AMD FreeSync and the VESA-backed Adaptive-Sync for pursuing the same display goals.
Besides bringing initial G-SYNC support to Linux, the NVIDIA 340.17 Beta Linux driver improves the KHR_debug and ARB_debug_output extensions, numerous bug-fixes, updates to NVIDIA-Settings, allows controlling FXAA via __GL_ALLOW_FXAA_USAGE and GLAllowFXAAUsage, and other smaller changes.
More details on the NVIDIA 340.17 Beta driver release for Linux users can be found via the official change-log at NVIDIA.com. As reminded this morning, pre-Fermi support will be dropped with the NVIDIA 343.xx driver.