I think this is a demotion for desktop apps. The phrase "Windows 8 style UI" implies that the colorful rectangle look is the style for Windows 8. The classic desktop environment, by implication, is not Windows 8 style.
The Metro look is supposed to be ported to the desktop experience (see: office 13, github for windows). Their intention is for normal desktop applications to adopt his theme.
The classic desktop environment is windows 8 style. Apps that are not developed for it, certainly are not Windows 8 style.
The classic desktop environment is windows 8 style. Apps that are not developed for it, certainly are not Windows 8 style.