Not only do they have face models. But they have immense details about those faces. Location, relationship connections, product endorsements, work and school connections...
After the last few revelations about the NSA that have come out. I think you should assume that it is all being used.
How about a text field that allows you to write something about them.
"Dude with weird hair, works for Widgets Inc. Said he was divorced but had a daughter in college."
Then make that info available when he calls me.
If your data, encrypted or not, travels through the US or any of it's allies, don't you think they already have access if they want it.
Privacy is an illusion.
I had the Atrix with the fingerprint sensor. The thing that I liked was being able to unlock the phone with one hand. But, the sensor was on the top back center, right where your index finger naturally landed. It was really nice when your hands were full.
Also keep in mind that the last portion starting with "I have a dream..." and following was all improvised. The original draft didn't include those words.
I don't have a lot of respect for any coder who is afraid of leaving the pretty GUI of Windows. They would rather fragment the project than get their hands dirty.