This is a very lightweight version of “Windows 8 Best-Of” of a previous post.
It contains the Metro UI style inspiration and essentials native controls (XAML) and the complete list of API namespaces.
Inspiration of the Metro UI design comes from the transport area.
Windows 8 is powered with C++.
WinRT design comes with modern C++ and use advances technique like template meta programming. See Channel9 video about Windows Runtime Library: http://channel9.msdn.com/Shows/C9-GoingNative/GoingNative-2-C-at-BUILD-Windows-Runtime-LibraryWRL-Meet-Tarek-and-Sridhar