Assassin's Creed Odyssey, out in October, is a full-on RPG, with dialogue trees, legendary loot, and even more abilities to develop than AC Origins. You can play as a male or female character, both with the same abilities and story lines (and no boobplate for the ladies, but give them time - I'll wager there'll be DLC boobplate eventually...). Unlike any other AC game, combat is resource-based. You fill up your glowing adrenaline tube by hitting, blocking, and dodging, and you can spend adrenaline on special combat abilities. In AC Odyssey, your home base is ... a boat. Ubisoft just can't seem to give up their toy boats. Of course for a game set in Greece, a boat is kind of a necessity.
AC Odyssey, which Ubisoft Quebec has been working on for three years, takes place during the Peloponnesian War in the 5th century BC. So, if you thought AC Origins didn't have enough Assassining, you ain't seen nothing yet. The First Civilization is still around, though, because your character carries a First Civ weapon - the Spear of Leonidas. Based on these introductory videos, it looks a lot like AC Origins gameplay, but with branching dialogue and a few other RPG elements.
Frankly, I don't know what to say. It looks to me like a straight up RPG-themed third person brawler. No stealth, no other signature series gameplay features. Calling this game Assassin's Creed is an odd choice.
Sept. 12 2019 update:
Discovery Tour is now available! Free update for Odyssey owners, also available as a $20 standalone for PC.