OmniVision and Sony do own 8-megapixel, backside-illuminated cameras which come in handy in capturing great looking images even in low light conditions, and will most probably be interchangeable where Apple is concerned. Would be interesting to see whether their performance are alike, or will there be some sort of difference which you can tell from the naked eye alone.
If there is a summer production ramp up, then it would mean a September launch for the next generation iPhone ring truer than ever, never mind that it still remains as a rumor currently.