The chipsets are already being developed, and Nvidia plans to have them out the door as early as next spring. While this will be Nvidia's first foray into the world of Intel IGPs, the move isn't particularly surprising. With AMD's recent purchase of ATI, the Intel motherboard market is likely to see itself deprived of future ATI-based IGP offerings.
This departure leaves said market ripe for the taking, so it's no surprise that Nvidia is choosing to broaden its involvement in the Intel chipset sector now.
The company also says it's working on nine derivatives of its GeForce 8800 GPU.