There are many sites with technical information about the Nokia 808 Pure View.
And they are so good that I dónt have to duplicate.
This page provides links to the best information.
Specs and other info on: NOKIA
Basic info and background on: WIKIPEDIA
An extensive review (but not totally unbiased) is on: GSM-ARENA
Another extensive and recent review of a real independent site is on: DP
You find the story behind the lens of the Nokia 808 PureView on: CARL ZEISS
Detailed information about all camera settings: DETAILS CAMERA