The yellow ones are most likely white leghorns, though from the pic a couple look like they have orange heads. I don't know what they are. I hope they aren't sex-links, those aren't purebreds and would seriously aggravate me.
My friend said there are only 2 that look like BR, and there are some that look like EE. But the ones she is thinking are EE are the brown striped ones, which could be EE but could also be brown leghorns.
Obviously there is one buff orpington.
There is one at the top of the pic (center) that is silvery spotted and black? I wonder what that one is? I can't wait till they get here so I can look at them better!
I hope I got some EE, those are the ones I really wanted! Didn't want to order 50+ chicks (for BR and EE), so I went with the rainbow pack.