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A month ago he said it was at least two years. I smell some copying going on. Or maybe just shotgun guessing. Gotta be right somehow...
How exactly except by guessing could you predict when Android devices with similarly accurate face recognition would come out?
 
Rear truedepth would only be useful if the range was FAR greater, as in, scanning rooms greater.
The point wouldn't be Face ID (other than identifying the people you meet), it's 3-D sensing for AR. The better the depth perception, the more convincing the integration of computer-generated objects into a 3-D environment.

The thing is, I don't think the combination of dot projector and 2-D camera (which is what we have with Face ID) is as effective on the back camera, for the same reason that a camera flash becomes useless when the subject matter is too far from the camera - the light spreads out and dims over distance. I think old-fashioned stereoscopic cameras will be more useful - it's likely easier to extract depth/position info by comparing the images from two lenses (the principle behind human depth perception) than it is to infer that depth from a single, 2-D image.

So, my prediction is that we'll see dual-lens back cameras (or more) on every new iPhone model going forward.
Light intensity drops with the square of the distance. If FaceID works fine up to maybe 0.5 metres, just going to 1 metre would require IR flood light and dot projector to be 4x as powerful.
 
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If the 2018 iPhone doesn’t have a true depth sensor on the rear-facing camera, I’m just going to hang on to my iPhone X for another year.
 
Having the rear TureDepth will only further delay. We want out iPhones in this life.

If the 2018 iPhone doesn’t have a true depth sensor on the rear-facing camera, I’m just going to hang on to my iPhone X for another year.

We say that about everything though
 
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