Just a quick update on the rumored Nikon Coolpix P500: in addition to the extra wheel on the lens for faster zooming, the camera will have a 22.5-810mm (x36) zoom and a 12MP back-illuminated CMOS sensor (probably made by Sony).
The current P100 model has 10.3MP back-illuminated CMOS sensor and a 26-678mm (x26) zoom.