As work on T132058 nears its conclusion we'll need to reach out to the Commons community to let them know of the change and address any concerns or questions.
Commons community is aware of the new feature being developed, are provided an opportunity to express concerns and discuss, and are informed of the eventual deployment - assuming the first two were completed sufficiently: )
Work done in support:
- Village Pump post: https://commons.wikimedia.org/wiki/Commons:Village_pump#Preparing_for_3D_models_on_Commons
- commons-l mailing list post: https://lists.wikimedia.org/pipermail/commons-l/2017-May/007833.html
- Blog post (DRAFT) for after the extension is enabled: https://meta.wikimedia.org/wiki/Wikimedia_Blog/Drafts/Wikimedia,_now_in_3D
Q2 (Oct-Dec 2017)