Amazon just dropped support, so these things are $20 all over auction sites right now.
But there’s precious little on the internet about teardowns and reverse-engineering. I know this isn’t exactly a hacking forum, but if there’s anyone with both the skills and interest, I figure they’d be here. 
Seems that link is dead
Hello this seems a bit interesting to me.
The SR300 camera inside the device appears looks to have the connector that exposes usb 3.0. There is a seller on aliexpress that has adapter cable (item # 32857332706)
The module has depth capture up to 1.5 meters.
Newer Linux kernel has built in support. http://lkml.iu.edu/hypermail/linux/kernel/1705.0/02968.html
here are a couple other links containing information
https://www.edn.com/teardown-amazons-echo-look-is-packed-with-tech/2/
I understand that the link might be dead but I’ve actually found quite a few of these so if anybody wants one I can arrange a price