So here it comes, Windows 8. This discussion on StackOverflow provides some really good answer about all-new WinRT platform from Microsoft employee. BTW seems like this fellow is definetely monitors and answers most of winrt tagged questions on StackOverflow, this is so nice of Microsoft.
Resume. Microsoft made .NET second time, this time in native languages. This results in all Windows 8 cool features we have seen, such as very low memory usage and blazingly fast speed. WPF and .NET just couldn't make it, even using DirectX, so Microsoft falled back to native apps. To me, as developer, this is actually a good thing, since we get a "Win32 Reloaded" platfrom which have all (or most of) RAD stuff which makes .NET so popular.
P.S. Related video.
Previous post on subject.