So the legacy mode will be available on both intel, and arm devices, which I believe will make up all windows 8 devices.
'Legacy' desktop applications would probably need to be recompiled to run on arm devices.
Windows 8 has the metro UI, as well as a win7 like UI to use with mice, and keyboard.
Don't like the Metro UI, just run the regular windows-looking desktop
So the legacy mode will be available on both intel, and arm devices, which I believe will make up all windows 8 devices. 'Legacy' desktop applications would probably need to be recompiled to run on arm devices.