it looks that they are rewritting some of the XNA features in C++11, e.g. SpriteFont, SpriteBatch, BasicEffect:
SpriteBatch, BasicEffect: http://blogs.msdn.com/b/shawnhar/archive/2012/03/02/spriteba...
Sprite Font: http://blogs.msdn.com/b/shawnhar/archive/2012/05/02/directxt...