Digitimes is reporting that Apple has placed orders for 3.2 mega pixel cameras that are designated for the next revision of the iPhone. The supplier to Apple will be Omnivision who beat out STMicroelectronics and Aptina Imaging for the Apple orders the source cited.
Also being reported is that Apple ordered "5-megapixel CIS orders for another Apple product expected to be launched later in the year." No other reference was given on what the potential new product may be but there have been hints that it could possible be included for the next revision of the iPod Touch.
As with any rumor take it with a grain of salt as nothing is confirmed until Apple announces it. Regardless the 3.2 mega pixel upgrade for the iPhone seems extremely plausible and should make it into the next version of the phone which may launch in June.