It seems like Manchester United and Arsenal got a few talents.
arsenal, for obvious reasons, they are specialist in building youngsters. But erm, the one i see most likely to shine is Jack Wilshere. Though i dunno about others because i hardly watch their games.
Manchester United too has a few.
Rafael da Silva - Seems to be a really good right back when he is calm.
Welbeck - incredible times he is having in Sunderland.
Evans - did well to fill Rio's boots while he is gone. This year, a little off, but we'll see =)
For Chelsea and Liverpool, im sorry, but i dont really see their youngsters playing. Maybe for Chelsea Sturridge, but i dont see him often on the pitch. As for Liverpool, probably Kelly? Ive seen him play, better than the first teamer in the position he played (because i not sure he right back or left back

)
Others like Marc Albrighton. Can consider Bale as youngsters? haha.
p/s: i dunno much, coz i dont play FM