NVIDIA today has announced their first beta Linux/Solaris/FreeBSD driver release in the 343.xx driver series. As expected, this release drops pre-Fermi hardware support from the Linux mainline driver code-base.
As we have known for months, those with GPUs older than the GeForce 400 "Fermi" series, you'll need to use NVIDIA's 340.xx legacy driver from here on out until you're able to switch over to the open-source Nouveau driver. The NVIDIA 340 legacy driver will still maintain support for newer Linux kernel and X.Org Server releases along with prominent bug-fixes, but won't otherwise receive new driver features, etc. NVIDIA's now maintaining multiple legacy drivers and they've been doing a good job at still supporting these drivers for vintage hardware for several extra years.