I thought about posting guesses a bit ago. I guess I'll go ahead and do so now since George did!
3. Cora, unless she's the cut (although I expect we'll have a female human squadmate regardless)
4. Drack, unless he's the cut (which I could see happening if he felt too much like Wrex/Grunt)
5. New species squadmate, but not a kett, because we will have a kett squadmate in a future title instead
6. Either a second new species squadmate or a new salarian, instead of a new turian (to the shock of Garrus lovers everywhere)