It seems that the Assassins are going to Ancient Greece.
Jeuxvideo-live.com, the outlet that originally leaked Crash Bandicoot N. Sane Trilogy for Xbox One, recently posted images of an "Assassin's Creed Odyssey" keychain. The keychain features a Spartan helmet which points to that era. The game supposedly takes place in Ancient Greece and is the sequel to Assassin's Creed Origins.
Full story from the WindowsCentral blog...