I would expect to see a few of the German side playing for the national team before long. Certainly Jerome Boateng has what it takes. Likewise Mesut Ozil, and Nauer the goalie. However I also think Dejagah has something, but is let down mostly by lack of experience, and Andreas Beck has the makings of a pretty fine right back.
From the England side I would guess Joe Hart is a fair bet for full England caps before long, the way we've been going through keepers. Obviously Micah Richards, Gabriel Agbonlahor, and Theo Walcot are already there. I suspect Onuoha may not have the sheer pace to compete long term with the likes of Kristian Pearce, so he'll struggle to get caps. I don't really know what to think about Michael Mancienne, he clearly has the talent, but is he learning to concentrate for long enough. Fabrice Muamba and Frazier Campbell have an outside chance, but I wouldn't want money on it. Jack Rodwell and Danny Rose are too young to tell, but very likely real stars of the future. The rest can probably forget it. Noble has everything but the speed, likewise Crainie. Johnson and Milner don't have the skill or the speed for the very top level. Cattermole strikes me as somebody who will have a long career as an unremarkable but solid pro.
To warn you of how much credence to give all that. I saw Kevin Keegan as a teenager and thought he was crap.