Source: Windows Team
quote: No recompiling or emulation of x86 on ARM. If you want to make software for an ARM tablet, it will be using WinRT for the Metro interface and go through the Windows Store. Period.
quote: The ONLY exception is that businesses will be able to sideload apps but they still have to be rewritten for WinRT and Metro. No desktop apps other than Office. On ARM tablets, they eventually want to get rid of the desktop.