We've already heard about Nvidia's GeForce 9800 GTX from a few sources, including DigiTimes. Those sources claim the card will be based on the same G92 graphics processor as recent GeForce 8800-series models, that it will have a higher core clock speed, and that it will come out in March.
A couple of reports by Chinese site Expreview shed more light on the purported graphics card. The first report lists detailed specifications for the 9800 GTX. Supposedly, the card will run at 675MHz with a 1688MHz shader clock and 512MB of GDDR3 memory running at 1100MHz. That's up from a 650MHz core speed, 1625MHz shader speed, and 970MHz memory speed for the GeForce 8800 GTS 512MB. The same site also claims the 9800 GTX will feature the same cooler as the 8800 GTS 512MB.
Expreview says there will be one notable difference between the 9800 GTX and existing G92-based offerings: the addition of three-way SLI support. Right now, only GeForce 8800 GTX and 8800 Ultra models can be used in three-way SLI setups, but both cards are based on the older 90nm G80 GPU rather than the G92.