Juvenil A:
Carles Alena (1998) Central midfielder
Lee Seung Woo (1998) Forward
Inaki Pena (1999) Goalkeeper
Juvenil B:
Guillem Jaime (1999) Right back
Abel Ruiz (2000) Striker
Cadete A:
Jandro Orellana (2000) Defensive midfielder
Sergio Gomez (2000) Winger
Cadete B:
Eric Garcia (2001) Central defender
Adria Bernabe (2001) Central midfielder
Infantil A:
Pablo Moreno (2002) Striker
Roberto Navarro (2002) Winger / Attacking midfielder
Infantil B:
Xavi Simons (2003) Defensive midfielder
You can add a whole lot of players to that list. But as this thread exemplifies, it's too early to judge anyone. Although if I had to pick one player right now around the B team except Samper, who I'm sure will make the first team one day, it's Carles Aleñà. Only thing that'd prevent it from happening is the amount of good midfield talents we have already, both at the first team (Rafinha, Roberto), on loan/buyback (Halilovic, Denis) and at the B team (Samper, Kaptoum).