It is possible, and it is about time a worthwhile camera sensor was used for an iPhone. But it's still too early to completely believe this. For all we know Apple could simply be testing with Sony components, but ultimately choose to use a cheaper component instead for the sake of getting the most profit.
It would be nice to see though.
Equipment:
Custom PC, MacBook Pro (MBPr), 3DSxl Blue, 3DS Midnight Purple, iPhone 4S Green