It was already known that the next game in the Batman: Arkham story line is being developed by Warner Bros. Montreal, a departure from the creators of the previous two games, Rocksteady Games. A new hands on demo revealed some more details about the gameplay for the latest iteration in this series, and it follows the "If it isn't broken, don't fix it," policy. The combat similar to the formula from Rocksteady will be joined by the all new Detective Mode that sees the Dark Knight use his high tech gadgets to recreate unseen events. The game itself takes place prior to the previous two games in the series, and follows Batman as he dodges villains out to kill him on Christmas Eve.
Source: Ars Technica