Looks like we will finally be getting support for developing games in C# for the Xbox One (also XAML and HTML/JavaScript)! As tweeted by @joebelfiore. This along with .NET Native and SIMD support in .NET -- I'm excited for the future of C# in game development!
http://blogs.msdn.com/b/dotnet/archive/2014/04/24/dotnetnative-performance.aspx