It's actually coming back in Android O as "Google Lens". [1] Highlights include identifying trees/flowers in view, automatically connecting to Wifi by pointing at the sticker on a router, and pulling up a business listing and ratings by pointing at a building.
Apparently it'll be a part of Google Camera, but also baked into the Assistant so you can take pictures within the context of your conversation to "show" the assistant things, clarify what you're talking about, or ask for more information about something unknown.
Can also apparently integrate with your other Google services, with one example given as pointing your phone at a theater marquee, it pulling up ticket prices for you, and you saying "add this to my calendar".
[1] https://techcrunch.com/2017/05/17/google-lens-will-let-smart...