:deal Froch v GGG as well (hopefully) Khan v Brook is a super fight as well but only here in the UK. I imagine its just a good fight in the US.
Clearly Cotto vs. Canelo, this fight is going to happen. The others are more or less speculation and wishful thinking.
It depends how do you define mega fight. If it needs to sell more than 2Mil ppv, I´m afraid it won´t happen soon. GGG won´t get his glory because of those cowards (And I don´t mean only Cotto or Canelo) who won´t let him build the momentum (Quillin, Jacobs). My guess would be Joshua vs Wilder at 2018.
The only Megafight left in this era is MayPac II (and III) Cotto Canelo is next best but it doesn't capture an international audience even 5% of the way MayPac does, even if that will only be half what the first fight was.
What terminology are we using here? To me superfight is two top tier fighters fighting each other, and a mega fight is 2 superstars fighting each other transcending the sport alone. Cotto-Canelo is really big but not quite "mega" by above definition.