You have to hand it to Xiaomi they know how to spin up the hype (see what I did there)
The same old patent pictures of a quad and a watch controlling it are being released and now we hear of a 4K camera.
No doubt the app appearing in app stores for a few hours is all part of it. I would expect the Xiaomi drone to land anytime soon.
Is it coming out of the same factory that is producing all the other wrist band/watch controlled multirotors??
Does it have http://www.ardupilot.org based hardware and software onboard as well??