Here you go...back of the 2011 Head Unit:
The two square white jacks on the left are the ones that do almost all of the work. They are identical on the 2011 and 2012 factory head units..although they are flipped 180 degrees...that's why they look different at first blush...they are EXACTLY the same.
The smaller square gray jack below them and to the right is the iPod/USB connector. On the 2012 it's above them.
The almost square white jack to the right of center is for the factory XM radio kit. Don't know what the one to the right of it is for...I've never seen them hooked up to anything.
All the way on the far right is the antenna connector jack.