NVIDIA has published a new beta graphics driver for Linux, Solaris and FreeBSD. R337.12 adds the support of some Maxwell-based graphics cards:
GeForce 830M GeForce 840M GeForce 845M GeForce GTX 850M GeForce GTX 860M GeForce GTX 870M GeForce GTX 880M GeForce GT 705 GeForce GT 720
The GLX_NV_delay_before_swap extension has been added (this extension is also exposed on the Windows version: WGL_NV_delay_before_swap). Complete release notes are available on the download page.
R337.12 is an OpenGL 4.4 driver and exposes 328 extensions (GL_ and GLX_) for a GeForce GTX 750 (Maxwell) under Linux Mint 16. The complete list of all extensions is available in THIS ENTRY of the GPU database (I submitted with GpuTest 0.7.0).