Ubisoft confirmed that no, AssassinsCreedMirage will not have in-game ads you can block with your money or a subscription model, but it will have cosmetics.
I can not believe this is something that has to be confirmed.
Also screw microtransactions, especially in a single player game that is said to not be a live service.
IMO EA has gotten a lot better. Outside of the sports section of there portfolio.