(MAY CONTAIN SPOILERS !!!!!) BonoGuy Here. I just watched a FESTIVAL OF BLOOD demo trailer narrated by a Suckerpunch Animation Director Billy Harper.
So New Powers include a ionic ability were you can turn into bats and fly around the city of New Marias. Instead of recieving Ionic Charge you have a corrupt meter that fills up draining blood from cilvilians. You also have a new ability were you can see the world as a vampire. ( MAkes peoples skeleton see through). The City and its people have been redesighned. The city know has large bonfires and darker alleys. And other features that are included with a dark festival. There are also dark catacoms below New Marias similar to the sewers in the first game. Your amp was stolen when you were kidnapped by the vampires so Cole has replaced it himself with a large cross. New enemies include Harpes that can fly around and bite normal ingame pedestrians turning them into newborns that can alson bite other pedestrians creating more enemies to battle.
The Game is non canon and is a story being narrated by Zeke in a bar trying to impress a woman.
Sorry for bad Grammar i.g
For the video go to Infamous 2 festival of blood at gamespot.