Crackdown 2, has announced that they're looking for new talent to help them with some new action titles they've started development on.
According to their "Since completing Ruffians first born, Crackdown 2, we've now moved onto a couple of new games... What we can say is they're really exciting, high action, visceral titles that are heavily focussed on online. Which could be a lot of games to be honest.":
Does this mean Crackdown 3 is in development? Maybe. It received mixed reviews, but still sold a ton of units, so it's logical that it could be one of the games being worked on.