As I understood how this works is as follows.
THe cover only has small holes and the display is online showing content on specific pixels which are aligned with those holes of the cover. So nothing much more than glance from nokia already does, if you put such a cover over glance it looks the same.
Or am I wrong?
You are correct, while the design looks really good, its not like when Nokia designs things, its not really thought of. for example, while the cover is fully open, the device can't sit flat, which makes it very springy while using on a surface.
There is an opening for the front facing camera, why?
The wholes collect lots of dirt, alot! Which come in contact with your face while calling.
It's very difficult to hold when typing a message.
I've used one, and my friend has the same exact comments.
I like how it looks, but its very bad in functionality.