Season 3: The Rings of Men make it to the hands of 9 men. Chaos ensues.
Season 4: Sauron creates the One Ring. Darkness prevails.
Season 5: Harfoots settle in the Shire area? Elves and Men unite to fight against Sauron. Sauron loses his hand (and ring).
I am not a Tolkien expert I just really enjoy the movies.
What other events do you think will happen in the series?