"Brotherhood is essentially Assassins Creed 2.5, not Assassins Creed 3 which is weird. They seemed to have got this out in time for Christmas to make that extra sale or 2 cause Assassins Creed 3 is not ready yet or something.
To be honest, it’s not an after thought. It’s a well-crafted story using the same engine as Assassins Creed 2, with some pretty sweet additions like cannons, horse riding in the city and a gun mounted to your arm." - GameState