So here at Microsoft, we have this thing called a 'buddy program' which you can read more about at http://msdn.microsoft.com/isv/isvbuddy/. I'm signed up for this program and have a 'buddy' who works for a company (I assume in Germany) doing Managed DirectX work (amongst other things). (Sorry, I only have time for one ISV buddy, so don't go signing up hoping to get assigned me unfortunately).
Anyway, my buddy has sent me a link of some of the things they've been working on using MDX:
The site itself is in German, so if you don't speak that, google's translater seems to do an adequate job. The third video is the most relevant to MDX.