We took a week off while trying to plan for the next 10 weeks or so. We'll have episodes on Unity, polishing games (particles and such), UI, VR, interviews at PAX, ec.,
I started with Pong as my first game as well, and did it in XNA. Today we announced that MonoGame, the open source implementation of XNA is coming to Xbox One / Win 10 as well, with some games through the ID@Xbox program already.
You shouldn't have to do anything with XAML if you are creating a game for Windows 10. You can do it all through DirectX, or middleware like Unity (which you illustrated), in which case is creates a XAML wrapper for you.