Nvidia has to get really efficient at this level or they're just going to lose all that new entry/low-end computer and laptops business. Intel will have decent graphic's in most all next generation offerings, if Nvidia can't provide solutions to OEMs and boutique builders they might not even be asked to show.
AMD APU platforms along with Hybrid Cross-Fire could becoming noteworthy (it seems as though it might start to become relevant although we've heard that for many years), and we see much of the entry/low-end computer and laptops business warming to AMD's APU's. As entry systems APU offer similar low-end CPU class leading graphics within a efficient package. Plenty good to be starting some gaming, all while still fairly good efficiency/battery life as a standalone solution. If laptops from boutique builders can option with Hybrid Cross-Fire and see the added benefit of the dual GPU's, while efficiency of just the APU graphics when not in 3D stress gaming they get the best of both. In desktops very similar, buy a APU desktop and then later a 75W AMD card and you have benefit of dual GPU's, while not even worrying about the PSU. Lastly pehaps some boost form Mantle. (yet to be seen)
For an Intel system and discrete Nvidia graphics, does Intel play-ball offering CPU SKu's with disabled graphics, while still a decent/cheap enough for builders to add Nvidia graphics and still tout class leading efficiency? Can or does the iGPU have a way of turning-off or disabling completely in the BIOS? If not might the iGPU section still be taking away some efficiency? do we se a time (if ever) when Intel permits the Nvidia chip to power down in non-stressful operations and hands-off to the Intel iGPU? (Is that something Intel see's in it's best interest long term?). While you aren't getting the anything like the Hybrid Cross-Fire advantage (ever?).
Nvidia has to be as good on an Intel CPU perf/w and price, as an APU Hybrid Cross-Fire arrangement to stay viable. I could see many OEMs and boutique builders seeing APU as a better seller as an entry laptop. They can be sold with and APU offering solid graphics, while offering a MXM slot for a premium. Down the road perhaps they can get the sale on the discrete card, while even for new "higher" battery. Desktop's can tout the upgrade of "Hybrid Cross-Fire option", while still the efficiency of powering down when under less stressful (2D) workloads.