Fifth Arc Rumors?

We all know there will be a fifth arc about the "ancient clans" but there is obviously more to that. It is rumored to  be about Thunder, Sky, Shadow, River, and Wind making the clans. Here are some RUMORED names for the fifth arc:

• Dawn of the Clans
• Birth of the Stars
• Rise of the Stars
• Birth of Justice
• Stars in the Sky

There is even some talk from fans about a sixth arc, which is not entirely out of the question, but since the Erins haven't even started the 5th arc that won't be confirmed for a few years.