The project "Polly" seems to have been created to introduce all new features of glTF 2.0.
https://www.youtube.com/watch?v=l7TB1O51X_M
However, I tried project_polly.gltf displayed in Babylon.js + glTF Loader, skinning animation seems not to be displayed correctly.
Babylon.js + glTF Loader + project_polly.gltf result:
http://jsdo.it/cx20/aGqk