Last week's update was the NVIDIA 304.116 update and provided support for modern kernel releases, an updated NVIDIA installer for detecting the GLAMOR EGL driver, and other changes. The update they're putting out today is still for the 304 legacy driver that supports the GeForce 6 and 7 series graphics processors.
Today's driver update is the NVIDIA 304.1170 driver and it simply provides support for X.Org Server 1.15. X.Org Server 1.15 is expected to be released before month's end with multiple new features. Yesterday marked the release of 1.15 RC4 Chai.
If you're still dependent upon this legacy driver for GeForce 6/7 series graphics processors instead of the open-source Nouveau driver, stop by NVIDIA.com for the 304.1170 Linux driver release.