Initially, the match between Kubrat Pulev and the winner of Joshua - Klitchko is foreseen to be played in September, 2017.
Let's see what will happen first in April. I think, Pulev is now more confident and experienced, after that single loss to Klitchko two years ago.
On the other hand, Klitchko is already 40 years old, has to have downturn in form, but Joshua is still favorite ...