Well Zetzu HAS TO BE in Konoha to watch the fight for Madara... plain and simple. Kishi may draw a closer up version of Zetzu, but most likely not...I really don't think so. Theres just no reason to do it. We've seen Zetsu plenty of times coming out of the surroundings after a fight is over, so why would Kishi decide that this time hes going to be sneaky about it?
Why I say he won't... is that he will present Madara having some new plans. Most likely they will involve stopping Sasuke from going to Konoha. And we won't know why. Other than Madara doesn't want to give Sasuke up to Konoha. If Pein loses to Naruto... Sasuke definitely will...
I guess we'll see...