Oh, my!
There have been various "printer/copier" compatible papers, films and other tricks to do something similar over the past couple of decades, but what is truly outstanding about this product is: 1) it's flexible, and 2) it's thin!
I have a project I'm working on right now that could use this. I was wringing my hands over how to do a custom PCB in thin and flexible without paying a fortune for a board house. So I thank you, and my wallet certainly thanks you!
EDIT: It's still just a research project (
http://printem.io). Rats!
I'll sign-up for their mail list, however. Maybe they'll offer pre-production samples to subscribers? Please?