The sole official change for this release is bringing proper support for the GeForce GTX TITAN that was released in mid-February. The Kepler-based TITAN features more than seven billion transistors, 2668 GPU cores, 4.5 TeraFLOPS of single-precision compute power, 1.3 TeraFLOPS of double-precision compute power, and GPU Boost 2.0, 6GB of GDDR5 video memory.
The NVIDIA GeForce GTX TITAN from the Linux perspective has already been discussed at length within NVIDIA Releases GeForce GTX "TITAN" GPU and GeForce Titan forum threads. It's unlikely, however, that there will be any Linux reviews of the GTX TITAN due to the troublesome NVIDIA PR/marketing department.
The new NVIDIA 313.26 Linux x86/x86_64 graphics driver can be fetched from NVIDIA.com.