So a question that I've always been curious about are devices that contain two cameras (one for video chat, etc., and one for everything else). Of course, it wouldn't be such a big deal on devices with low-resolution displays, but because of the advent of the iPhone 4 and new iPad (/iPad 3rd Generation), those crummy VGA quality cameras really detract away from an ideal experience.
Using this article at PC Magazine, we can see that it could possibly be the price difference...
...The new camera is three times more costly than the earlier model...
Because looking at the teardown photo from iFixit really doesn't make it appear to be a physical size issue (not downplaying the cramped quarters of the real estate inside an iPad, but the VGA and HD cameras appear to be roughly the same size).
So at this point in the game, why not use the same higher quality camera for both sides of the iPad?