Matt Miesnieks:

I know glasses are being worked on at Apple, and the prototypes are state of the art. I also know what it takes to build a full-stack wearable AR HMD, having built fully functional prototypes from scratch. There are a bunch of elements that need to work before a consumer product can exist. These elements don’t all exist today (even at the state of the art).

Lots and lots of detail in this post. I found it well written, very understandable. Perhaps my favorite little tidbit:

Imagine that virtual hat from a Snap Filter being something you could virtually wear all day, and everyone (or only people you filter) else wearing AR Glasses could see it on you.

I highly recommend this if you have any interested in AR and Apple Glasses.