I am a game developer who made games in .Net languages with XNA for the past four versions of it. Unfortunately now there's this news: http://www.gamasutra.com/view/news/185894/Its_official_XNA_is_dead.php#.UQ3yiehQCh8
I am surveying the ecosystem of game engines, looking for something that supports coding in Visual Studio (I use F# heavily, believe it or not!) and I am having trouble finding something that is high quality, still alive, and high performance to replace XNA. Unity for example misses the mark because it only allows for scripting in MonoDevelop, while I want a more developer friendly experience.
So what is a good replacement for XNA?
If you want to leverage on XNA API, you should bet on MonoGame. It is a compatible XNA API that is targeting to run on several platforms (including several non Windows platforms using OpenGL). The development is very active, MonoGame is recently getting a full 3D stack that is starting to work on Windows Metro app (thanks to SharpDX). You can have a look at the latest develop3d branch.