It's believed that Apple will likely add a specialized chip to the motherboard of its Intel-based systems that the Mac OS X must first detect prior to booting. Either that or the company will contract a proprietary motherboard chipset from Intel that will perform a similar function.
However, don't rule out the possibility of Apple Macs being able to run Windows - this is indeed very possible. Just imagine being able to tri-boot Windows, Mac OS X and some Mac compatible Linux on the same Powerbook! Yum!