This is something that I am super excited about. This is what sculpties should have been. Full meshes that can be animated! And, they can also be made to replace the avatar but move with you.
I am curious too how physics will be with it, as I am curious about using it for building houses.
Although with LL's recent layoffs, I wonder how this will hinder development of new features. Although as far as useless new features, I think the new voice changer that is in the Viewer 2.1 is up there.