I have been in contact with someone since a while now, and I can tell you that person is really working on InMoov's hands. In fact, some suggestions came from him, for exemple the new brackets and the rotational bicep.
Have a look at all his pictures, he did a great job. I am so delighted when I see others constructions, it really helps to make me go on with this project.
To see more of his work: Here