Is it possible that there might be more than just a 5 card cycle of gods at Mythic? Maybe we'll have have gods at lower rarity as well in different colour combinations. I could also maybe the see former elven gods getting a rare cycle or something, but I don't know if they'd still be "Creature - God" in that case.
Edit: Maro's hint of "protection from God creatures” appearing in rules text makes it seem a little more likely that there might be more than just 5 Gods
Edit: Maro's hint of "protection from God creatures” appearing in rules text makes it seem a little more likely that there might be more than just 5 Gods