Ben Lovejoy, writing at 9to5Mac:

A supply chain report out of Taiwan claims that Apple is facing significant yield problems with the 3D sensors used in the TrueDepth camera module of the iPhone X. One source says that production volumes for the flagship phone are so low that they are being measured in tens of thousands of units per day.

I’ve got a friend who’s planning on ordering an iPhone X as soon as it comes out, and I keep telling him that he’s not going to see it until January 2018 at the very earliest. Looks like my prediction is holding up nicely so far.