https://www.cnet.com/news/assassins-creed-odyssey-e3-reveal/

If you were paying attention to leaks before E3 2018 started, you already knew there was a new Assassin's Creed game on the way -- one big enough that Ubisoft had to reveal the game's full name, Assassin's Creed Odyssey, early. We knew it was set in Ancient Greece. We knew it was coming this year. Now, we have a trailer and some significant gameplay details for the game.

Set in 431 BC, Odyssey follows the exploits of one of two playable characters, Kassandra and Alexios, through the events of the Peloponnesian War. Once you choose one character, that will be it for the rest of the game, so no character switching like we saw in Assassin's Creed Syndicate. Either of the characters possesses the Spear of Leonidas, which will play a major role in gameplay and in the story.