Ubisoft has released a new gameplay demonstration of
Assassin's Creed II: Black Flag which shows the mission that was playable by visitors of GamesCom, the attack on a fort overlooking the sea: Edward will first bomb defensive towers from his ship, then land and attack the Fort. You find it here, commented from game director Ashraf Ismail with subtitles in Italian. The version shown is that PS4 , and we should find a similar graphics on Xbox One .
MX Video - Assassin's Creed IV: Black Flag