I have both a Canon and Nikon digital still camera that can't go to f 2.0. That makes a huge difference in small hand held cameras when used in low light conditions (which is all too frequent).
I wonder if this new Nokia camera technology is based on Tessera's new MEMs technology which is suppose to eliminate voice coil motors. VCMs are power hogs and are slow to respond to auto focus commands compared to the MEMs silicon (solid state) technology.
Digital Optics Corporation (the company owned by Tessera) was recently granted patent 8,238,739 (which can be googled since Yahoo no longer allows links) which describes a lot of features that sound similar to the ones Nokia discussed in their Lumia 920 presentation.
Regardless what technology Nokia is using in their Lumia 920, a small hand held camera that can go down to an aperture setting of F2.0 is a major leap in performance.