Well, without repeating the names that have already mentioned (IE: Amir Khan, Canelo Alverez, Yuriorkis Gamboa, JuanMa etc.) I gotta say Antonio Escalante. Tony already has a massive fanbase, fan friendly, great personality, and has all the tools in his tool box. He is a superstar in the making and if GBP would get their head out of their arses and hype him up like they did Victor Ortiz, then we got ourselves a superstar.
It's looking like A Mere Con Juanma Lopez maybe if he proves the Mtagwa fight was an aberration Gamboa if he continues dominating his opposition and maybe builds a nice rivalry with Juanma Canelo and JCC Jr. if they take their fight to the next level though Canelo seems more likely to reach it than JCC But my money right now is on Amir Khan
Saul Alvarez hands down - 20 years old - 33 wins,25 ko's! - undefeated against decent opponents what a future this kid has. If he can get past baldo i'de say he'll get a shot at a legitimate title in either welterweight or light middleweight within 12 months.
Saul "Canelo" Alvarez Alfredo "El Perro" Angulo Julio Cesar Chavez Jr. "Vicious" Victor Ortiz Jose Benavidez Jr.
Can't believe how many people chose Khan! He has nothing indicating future superstar status. His style is not fan friendly, it's actually quite boring now that he is a safety first fighter. He doesn't have the most impressive skills or noted power or anything that will make people sit up and take notice (he does have phenomenal speed but that's about it). His personality doesn't exactly inspire either. Then you have the small matter of his unwillingness to take on anyone even remotely resembling a challenge because of his fragile chin. Saul Alverez, Jose Benevidez, Victor Ortiz, Frankie Gavin, Frankie Gomez, James Degale, Juan Manuel Lopez, Andre Dirrell, Andre Ward, David Lemieux, Yoriorkis Gamboa, these are the guys with the potential to become future superstars of boxing.