The NVIDIA 280.13 build doesn't offer up too much for x86/x86_64 Linux beyond what was already found in the 280.11 beta build. However, there are some changes compared to the previous 275 driver series. The NVIDIA 280.13 driver offers support for new ASICs (the GeForce GTX 570M/580M), various GLX bugs, an X driver bug, new GLX protocol support, and various other fixes.
This newest proprietary Linux driver from NVIDIA for GeForce and Quadro graphics can be downloaded from their web-site. If you happen to be running older NVIDIA hardware, last week they released a batch of vintage Linux drivers.