I was really impressed and happy with the blood in DA, especially how it would stay on the ground and then your footsteps would walk in it and carry it around the stage.
I also liked the certain moves characters did that would resultin blood, including the eye pokes and the impalings...blood would just goosh out in big circular globs, with that sickening noise.
Since Blood is obviously one of the biggets features in MK to date, are they needing any improvements for deception? my only thought is maybe improve the weapon combat blood scheme: like when you get sliced its more of a smaller dot sized "spray" as opposed to globs.