Newly leaked information
Intriguingly, Cormac's story will apparently tie into the Kenway family saga that started in Assassin's Creed 3 before continuing in Black Flag, though it'll also tie into the upcoming Assassin's Creed Unity. The game takes place against a backdrop of The Seven Years' War, which has direct ties to the French Revolution.
The story of Shay is one of revenge. For the first time in the Assassin's Creed® franchise, experience the journey of a Templar hunting down his former Assassin brothers.Available November 11, exclusively on Xbox 360 and PS3.
More info on http://www.assassinscreed.com