You mean Metro? Also, Microsoft are not calling it Metro anymore. Nobody knows what the UI design language should be called now.
HTML5 + CSS + JScript be a staple for a very long time to come. Other than that, in SA at least, I dont see Java or .NET dying any time soon, especially in the workplace. Python and Ruby will continue to have die hard enthusiasts and C++ wont become like COBOL because C++ is still relevant in OS development and the Wired (Arduino) platforms.
Slightly relevant but I hope that Webkit becomes a standard, We're waiting on FF and M$

but I dont see that happening anytime soon