Well, Ubisoft said that AC series was trilogy, but my friend did not think on it, so he said:

"I think it's going to be 5 games..."
Me: "What???? And why 5?"
Him: "You know: AEIOU"
Me: "õ.0"
Him: "It frist started with Altaïr, so it's the A, now it's Ezio, the E, the next would be the I and so on..."
M': "~(-.-)~"