mcrain provides details from this ZDNet article discussing NVidia's future plans:
In general, they talk of an upcoming chip design:
The new chip will be manufactured on Taiwan Semiconductor Manufacturing Co.'s latest 0.13-micron manufacturing process, Huang said. Huang did not reveal the name or specific features of the chip, but did say it was a fundamentally new architecture from the GeForce 4 Titanium introduced earlier this year.
Huang also claims that they expect to have the largest share of the Mac market "very soon." And finally:
"You are going to see many more exciting introductions in [the Mac] space"
sparkleytone notes that this may relate to a previous rumor of an Apple branded card which may have been developed with NVidia.
Related Link: Apple New Graphics Card?