In a recent gameplay video, IGN revealed (kudos to AccessTheAnimus for spotting it) that Assassins Creed Odyssey will feature two gameplay modes. The first one will be called Guided Mode and will be similar to what gamers have been experiencing in the previous AC games and the other one will be called Exploration Mode.
Source: N4G PC Assassin's Creed Odyssey will feature two gameplay modes: Guided Mode and Exploration Mode