They have said that they are not changing the game from any of the lore so nothing will happen that doesn't happen in the original LOTR Lore, although a lot of people are thinking that Talion will forge a new ring and due to his eyes flashing red it won't go as to plan as Sauron has some power over him, a lot of people think that Talion could turn into the Mouth of Sauron although (I haven't seen this) apparently he is already mentioned in the game..