Apparently, a new MotoMod (sort of) has been shown at CES 2017. It's called the Lenovo New Glass C200 and it's a smart glasses setup similar to Google Glass.
The original source is in Chinese so it's tough to translate what it says, but what we do know is that after attaching the C200 to a Moto Z smartphone, you'll need its dedicated app to use its features and set it up. This won't be a consumer device, though. It will help industry workers work more efficiently through AR.
As you can see from the pics, the device comes with its own camera, allowing you to see what the device sees on your Moto Z.
Here you can see more pictures of this product: