According to Digitimes sources Apple [AAPL] have placed an order for a number of 5 megapixel CMOS image sensors to be used in next generation Apple products. This could mean that if an iPhone is launched next year that it will sport a better camera than previous models. Anonymous sources have stated that the order was specifically for the next generation iPhone due out in the middle of 2010.
Although no official information has been provided by Apple on this case, and it never will be until they announce the phone mid next year, we are left with just speculation or rumour at the moment.
It will be interesting to see what new goodies Apple can bring to a 4th generation product. Perhaps more speed and a new camera as suggested here.