WinUnleaked has some new leaked screenshots from Microsoft's Windows 8 RTM (Release to Manufacturers) build that show how the new OS will look. From the look of them, Microsoft is making an effort to make Metro work as a unifying design across all of Windows 8.
The big difference is that IE10 now changes its color to coordinate itself with the color scheme of Windows 8. It seems reasonable to guess that other apps will eventually get similar treatment, since Microsoft also made the color scheme the same for window borders and the taskbar.
The only ugly bit is the new boot screen, with that hideous Windows 8 logo on black: