6x4 or smaller?

Now correct me if I am wrong, but isn’t this basically what Polaroid has been doing for years, just a lot smaller?

...how much will the prints cost?

If the device is 4.5 by 3 inches (approx) then it'll be likely that the photos are credit card size - woohoo, that's really useful.

And to Dan - yes but this is the digital age now !!