I say Wlad will retire or at least go another few years before he gets beat, as I don't see anyone in the HW division toppling him.

It's hard to say who'll be the next champ because it's really hard for guys to shine in that division when K2 are head and shoulders above everyone.

My guess would be either Helenius (who I'm still optimistic about even though he rightfully lost to Chisora), Price or Odlanier Solis.