https://www.pcgamer.com/assassins-creed-odyssey-release-date-e3-trailer/

Assassin's Creed Odyssey's release date has seemingly been leaked on Ubisoft's store. The game's release date is pegged as 5 October, though the fancier editions offer access three days earlier. Here's a screengrab:

Here's how the game is summarised: "Write your own epic odyssey and become a legendary Spartan hero. Forge your destiny in a world on the brink of tearing itself apart. Influence how history unfolds in an ever-changing world shaped by your choices." Here's more from the store page on what's in the game: