Just to put the monkey wrench in again, there is clearly a smudge (or something) on the screen of this thing that could be the front mounted camera in pretty much the exact right location.
Also, if the camera is supposed to be under the glass (and it is), and this is an iphone without any "naughty bits" (also looks to be the case), then the front mounted camera wouldn't actually be there. The glass over the top of where it is supposed to be mounted need not show anything either.
So we could still be talking about a front mounted camera anyway. *crosses fingers*
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As you pointed out you can see a smudge just above the earpiece grill. I would take a guess that this would disappear to black once the camera is in place. It doesn't look symmetrical as what would be expected but as you point out it would be under the glass and would not be visible so that would obviously not matter.
I really hope their is a front mounted camera as well. Not for video calling as that is done so rarely it seems pointless but for other applications that the iPhone could use it for. Anyone thinking iPhone Photo Booth?? Then again El Jobso might pull something else out of the bag that would actually make video calling popular. Creating a market as it were. The speculation is killing me and that darn Countdown to WWDC widget is not helping!!!