We have graduated a fair number of players after Sturridge and Schmeichel but they were are last two that are highly decorated. Vladimir Weiss City's U-21 and U-18 teams have been among the best in the league this year but it's tough to break through when there are high expectations for world class players. We have a few (mostly youngsters who have been signed from other countries at 16 to be honest) who will definitely go on to be very successful, but whether or not that'll be at City remains to be seen.
Jordi Hiwula and Devante Cole are both young English strikers who I think will definitely go on to play professional football and be quality players -- they are our top two scorers for the U-21s (EDS) and have been fantastic this year. Shay Facey (LB) and Angus Gunn (GK) are probably are two other biggest English talents if I had to guess. I don't think Facey will ever approach our first team but he did sign an extension until 2016 the other day.
Some of the other top prospects at the U-21 level. I think all of these guys will be pros pretty easily:
Forward: Jose Angel Pozo
Attacking Midfield/Wingers: Marcos Lopes, Sinan Bytyqi, Albert Rusnak
Central Midfield: Emyr Huws (full Wales caps), George Evans, Olivier Ntcham, Seko Fofana
Defense: Karim Rekik (full Dutch caps), Mathias Bossaerts, Jason Denayer
Most of our U-18 team is British but there is some quality there.