First of all, the NVIDIA GeForce GTX 750, GTX 750 Ti, GTX 745, and GTX TITAN Black are now officially supported. The Maxwell GM107-based GTX 750 series have already been supported since the earlier 334 Linux beta but now the support has been officialized with the hardware being on the market. If you haven't already, be sure to checkout our Linux reviews of the GeForce GTX 750 Ti and most recently was the eVGA GeForce GTX 750. There's also a look at the power efficiency from the GeForce 6600 GT through GTX 750 series using a whole lot of mid-range NVIDIA GPUs. The GTX 750 is a great $120 Linux graphics card.
Other changes for today's NVIDIA 334.21 Linux driver update include a NVIDIA kernel module security fix for a userspace pointer dereference, OpenGL bug-fixes, support for GPUs with VDPAU feature set E, improved application profile support, improved performance of OpenGL applications when used in conjunction with the X driver's composition pipeline, NVIDIA Settings control panel updates, and other fixes.
From the earlier 334 Linux beta this driver also carries 64-bit EGL and OpenGL ES support and other changes. More details on the new NVIDIA 334.21 Linux driver release can be found at NVIDIA.com.