Nokia 808 Pureview now, or Nokia Lumia with Pureview later?

Like what? Convince me that some "brand new features" in a Windows OS upgrade could ever be significant enough to outweigh the Nokia 808's unbelivable sound quality, 26mm Zeiss aspheric 41MP Pureview cam and video.

This new Windows phone's "Pureview" tech will be greatly watered down compared to the 808--Nokia already said that.

What OS feature could this possibly be? A new Angry Birds game that only runs in Windows? Please be specific.