Imagine the repercussions if Microsoft actually did rename Metro to Windows 8 Apps.

XBOX Windows 8 UI/Apps ? Windows RT Windows 8 Apps Windows 9, - Windows 8 Apps ?

They can't just later rename it to Windows Apps either as that is too generic and would conflict with Desktop applications and the desktop is here to stay for on at least another one to two iterations of Windows.

Maybe they think people would not associate "Windows Apps" with normal desktop apps ?