the most likely events to occur in my opinion are....

1. Shika binds hidan with his shadow again (maybe he didn't waste all his chkra and lose the use of it, instead he released it to make hidan think is chakra ran out). This will allow him to do another fatal blow, and hurt both kakuzu, and hidan. You have to remember hidan turned away once he thought he killed shika.

2. Like some have thought he will stab himself again thinking somehow shika wasn't killed, thus injuring kakuzu again before realizeing something is wrong.

3. Naruto comes and save shika by blasting hidan away with the new jutsu ( Remember kishi has always saved shika in this sort of way, right before he can die someone comes last minute). Since hidan will still be in his ritual kakuzu will also get hurt by the jutsu. Thus leaveing kakashi the chance to own him again.