They came up with those http://kotaku.com/#!5799286/the-insane-numbers-of-brink by accounting for every single possible variable and then multiplying, I wouldn't put to much stock in it. My guess is that there will be people who look similar, it will be rare to see 2 people who look the same though.
''hey that guy looks just like me.. wait nevermind he got the blue-green tint on his pants while I got the dark-blue one''
YEEEAAAAHEDIT: You should expect alot of the same clothing in the future however, I mean.. There are some that are more visually appealing to the masses, I can see: The Anger Bandana, The Anger Shirt, The Eel Vest, The Eel Mask, The Bug Mask and The Lost Jacket being over-used if I can say that
.. I will use some of those :>