That said; I cannot find any:
- architecture explanation
- code
- technical details
- API access information
Feels very DeepMind / 2015, and that's a bummer. I think the point of the "we have no moat" email has been taken to heart at Google, and they continue to be on the path of great demos, bleh product launches two years later, and no open access in the interim.
That said, just knowing this is possible - world navigation based on a photo and a text description with up to a minute of held context -- is amazing, and I believe will inspire some groups out there to put out open versions.