he planned to have Kratos cut Zeus’ head off after 5 minutes. Then all of a sudden, all the different gods from different mythologies (Egyptian, Norse, etc.) start pouring out and decide who gets to be the bigger power among all of the old religions. He also mentioned that an Egyptian version of Kratos makes an appearance. At the end, Kratos manages to kill all of them by tricking them into fighting each other. Since the only way to kill a god is to make people stop believing in him/her, getting the gods distracted somehow made people suffer and, as a result, stop believing in them.
That’s not all, though: David Jaffe also planned to have Kratos slit his own wrist with his Blades of Chaos via SixAxis controls so that he can be together with his family in the underworld. The final shot of his planned ending was a controllable segment involving the Three Wise Men and the birth of all the new religions.