Yes, we want to support additional features of DirectX 10, 11 and 11.1, but currently the focus is to become 100% XNA compatible and feature complete.
After that we plan to use compiler directives ("XNAEXT") to enable the extended feature-set. Currently we are using this only for the "Motion Sensing Device" support (currently Kinect only, maybe WiiMote and Move later). Some parts (geometry and compute
shaders e.g.) are not very diffcult to implement, maybe some other things are harder.
If you have specific features that you need/want please feel free to open a feature request in the issue tracker or a source patch if you are able to implement it yourself.
Thank you for your interest in our project.