According to this, the four new types of missions to be included in the PC version of Assassin’s Creed are Archer Assassination, Rooftop Race Challenge, Merchant Stand Destruction Challenge and Escort Challenge.
“The Archer Assassination requires the player to assassinate the archers in a dedicated zone without being seen,” said Charles Beauchemin, technical lead at Ubisoft. “In the Rooftop Race Challenge, the player will meet an informer and will have a set amount of time to reach a second informer. In the Merchant Stand Destruction, some merchants have ties to the assassination target and their activities must be stopped by Altaïr. Finally, in the Escort Challenge, the player needs to securely escort a fellow assassin from point A to point B.”
No new version’s coming out in March, but Ubisoft hasn’t released a specific date as yet.