It's definitely too early to tell, but I can give you my best guesses.
EE - pullets
RIR - pullet and cockerel
Australorp - pullet and cockerel
Thats the best I can do, and I'm probably wrong. I'm just basing that off of comb size. You can always try again in a couple of weeks.
I thought I'd post updated photos now that the chicks are nine weeks. I have suspicions about a couple of them but I really have no clue about determining if I have cockerels.
On another note, what's the difference between the terms cockerel and rooster?
Forgive me for all the photos of my Australorps. They're so gosh darn hard to tell apart. Two have larger, pinkish combs, one has a smaller comb, and one has yellow feet, so I'm thinking it's actually a Jersey Giant. Eek!