In that sense this might better be a placeholder or a discussion ticket as to what to do to load such models and if there’s something else one would like to do in in the pipeline.
We don’t currently have any plans for loading 3D tiles specifically, but the assets are glTF files which we fully support. AFAIK, there are no 3D tiles specific extension that is required. So at least loading assets should be relatively straight forward.
Poking around a bit, Patrick Cozzi confirms a glTF loader is good place to start, but this new format requires pieces to handle the loading and streaming of data and the spatial hierarchy so that the appropriate tiles for a given view can be loaded.