De-emphasis? What are you talking about? .NET is a first class citizen in Windows 8.... I don't understand how this thinking has emerged. For one thing, it's wrong. For another, it's wrong....
WinRT supports .NET, HTML5 and C/C++. This has been the case since the modern Windows programming model was announced at BUILD 2011.
Where's this confusion stemming from? Is it because we (I, especially) have been promoting C++? I've already addressed that aspect several times.... C++ evangelism went mostly dark during the .NET Everywhere years and my goal has been to push native into the forefront (where it belongs), bringing how and when we talk about C++ up to par with .NET content on Channel 9.
WinRT doesn't pick favorites... If you're a .NET developer, then you're all set. If you're an HTML5 developer, then you're all set. If you're a C/C++ programmer, then you're all set. This can't be made more clear.