This option has been tried before on the PC with such games as 
NBA Live 2000 but the folks at Ubi are trying it out on a console game instead of a PC. Using your Live Vision camera, you can put a picture of your face into the 
Rainbow Six Vegas. Just take a picture of the front and one side view and the game does the rest. There are a ton of other customizations as detailed in the video below. Me, I'm going to try to put my cat Stewie in the game as one of the Rainbow Six members.
Thanks 
Kotaku.