Digitimes is reporting that OmniVision has received an order from Apple for 40-45 million CMOS sensors packing 5 megapixels, bound for next year’s 4th generation iPhone. That’s nearly double the unites — and a huge increase in pixel count — from the iPhone 3GS cameras OmniVision currently supplies.

As with all next-gen iPhone rumors, take this one with an iTablet-sized grain of salt, but it does make competitive sense for Apple to bump the camera next year, among other things (cough iPhone HD cough).

(Personally, I prefer lower pixel counts and higher sensor sizes; cutting them up so much results in bigger pictures, not better. Low light should be the arms race here, manufacturers.)

Of course, we’ll never know for sure until WWDC 2010 when Steve Jobs (or Phil Schiller) hoists it up on stage.

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Rumor: 4th Generation iPhone to Pack 5 Megapixel Camera?