A Japanese trailer came out today for the Jetstream Sam DLC, which comes out tomorrow.
Really impressed with the quality in the trailer, the cutscenes actually match the quality of the ones in the main game and Sam seems to play quite differently from Raiden. He uses a taunt to provoke an enemy at one point in the trailer, seems to have a much more traditional dodge than the Offensive Defense move in the main game, and also has a double jump and air-dash move. On top of all of this his combos look pretty different from Raiden's. Super hyped for this, can't wait to play it tomorrow.