As expected, today NVIDIA unveiled their GeForce GTX 200 family of graphics processors. At this time their family is a bit small with only the GeForce GTX 260 and GTX 280 being shown off, but the GTX family should grown soon. These GTX GPUs support CUDA (with PhysX support), second generation NVIDIA unified architecture, 3-way SLI Technology, and PureVideo HD. The NVIDIA GeForce GTX 260 is made up of 192 processing cores, 576MHz core clock, 999MHz memory clock for its 896MB GDDR3 memory on a 448-bit interface. The fastest GTX processor right now, the GTX 280, has 240 processing cores, 602MHz core clock, 1107MHz memory clock for its 1GB GDDR3 memory on a 512-bit interface. Right now there is no NVIDIA Linux driver to support these next-generation GPUs, but once there is we'll let you know along with providing a performance run-down and other analysis. The GTX 260 costs $399 USD while the GeForce GTX 280 will set you back $649.
More information is available in the NVIDIA press release
and checking out their product pages