What is the new hole on the face of the iPhone 4S for?

Above the screen of an iPhone 4 you find a long horizontal hole used as a speaker to place next to your ear.  The iPhone 4S has an additional horizontal hole above the "ear speaker".  What is this new hole for?
Wild guess..  A second microphone for noise cancellation (so Siri or the person you are speaking to can hear better in a noisy place)?
In any case.. (a pun) you might want to avoid buying an iPhone screen film cover that doesn't have the new cutout for the new hole

I don't see a "hole" on the black iPhone 4s images on the Apple web site. Best guess is that this is not a hole but a sensor of some kind (proximity, light level, whatever). I don't expect a screen shield to significantly impact it's functionality.

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