I don't know, a face is a face. I just checked this bug out using the camera app, Very Interesting!;
I set it to Camera2, my face was a mirror image, I held a text card and yes the text was reversed.
I set it to Camera2 Flipped, my face was "normal", text was readable.
Here's what's ODD, in the Camera2 setting, if I "barrel rolled" rotated the camera 360 degrees while watching the monitor, My face was always upright!
If I set it to "Camera2 Flip" and rotated the camera, my image rotates upside down as the camera rotates.
Gulp... iPhone 4S It just Works...
Energy 21916 Sense 2.5 Cookie 2.0 Jul 04
18.104.22.168 (stock was 22.214.171.124)
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"Beneath the surface of the mud.... there's more mud still.... Suprise", CSN