@Dominik, Thanks for mentioning us and linking our video. 
@Paul Nice work on your Blender character, just to catch you up we have been working on a Mycroft compatible 3D Avatar for about 6 months. It has come a long way and we are working towards a publicly available release as quickly as possible.
Here is a link to the most recent demo video.
The first version may have to run alongside your Mycroft device, but we do have plans to incorporate a way to run the Avatar using the new GUI system which would allow it to then run on the MarkII.
There are a couple of hurdles to this. The new GUI for the MarkII has built-in face graphics and such that are much more optimized for the MarkII hardware than running a full 3D Avatar. The built-in face graphics are not yet able to be overridden, which means a potential 3D Avatar skill cannot be set to be the default for listening and speaking states (yet?).
The current version works using local websockets so could be run on your computer separate from Mycroft no problem. We’ll be posting updates about the upcoming publicly available release on this post.
Cheers,
Joshua