I'm not sure the interesting split is ARM vs x86. There is clearly a lot of interest in putting ARM chips in laptops and desktops, so why shouldn't the desktop

I'm not sure the interesting split is ARM vs x86. There is clearly a lot of interest in putting ARM chips in laptops and desktops, so why shouldn't the desktop version of Windows 8 support ARM? At the same time Intel is trying to make mobile chips, so it might just be that the mobile version of Windows 8 will be Metro-only, regardless of whether it's running on x86 or ARM.