Eeeer... the only ways Intel could "break" Optimus would be either by encrypting the Framebuffer or by giving their graphics chips dedicated video memory. But besides that: What benefit would Intel have from doing that (breaking Optimus)?Thats the thing about optimus, how efficient would it actually be? With PowerXpress it isnt broken because AMD update a chipset. Each time Intel update their chipset nVidia would have to play catch up.
Anyway: No matter if PowerXpress works or not: It requires an ATI chipset, which requires an AMD CPU. And if Apple wanted to switch to AMD, they could just as well stay with C2D.