There will be NO 9400m working with an Intel Nehalem CPU! Nvidia's license doesn't permit it according to Intel. Intel isn't stupid, and it's not going to let Nvidia steal its business. It definitely learned from this loophole!
When Apple switches to Nehalem in the Mac notebooks, we will see an Intel integrated graphics solution, OR Apple will completely have to remove the integrated graphics and just use a dedicated card. The problem with the newest Intel integrated graphics for Nehalem is they operate at around 55 to 60% of the power of the Nvidia 9400m!
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I can't see Apple going i7 with the laptops. What we are more likely to get is i5 in the iMac/mini and MB/MBPro. i5 is the mainstream chip and Nvidia does have a license to make chipsets for i5 as it doesn't use QPI bus, but uses a different bus that Intel have licensed to Nvidia.
i7 is for extreme/enthusiast market, and it will also help them differentiate between the Mac Pro and the other products. Mac Pro will take the Xeon 3500/5500 based on i7 with the other products using the mainstream i5.
Of course some of the i5 cpu's are supposed to have the gpu integrated as well so that may be an alternative.