Bach has done some work the last few days on moving parts of the model-loader extension to core and cleaning up the 3D support in core.
This means that if you work on the 3D API on a fork, you’ll have to adapt your changes to core now. Also, we removed support for MD5. This will be remedied by a loader for (skinned) FBX models in the near future.
More updates on the 3D API soon, stay tuned.