Mayuri: I think Mayuri might have lost his spirit powers. Because there are the 2 points on the body that control spirit powers, the spirit link and soul sleep IIRC, and most of his torso got destroyed, including the part people seem to aim at to remove them. I'm guessing he's still alive because he'll figure out a way to regenerate them or make artificial ones and come back stronger..
Tousen: Is the Shinigami that killed the woman he knew stated to be dead? Because it would be interesting if he went with Aizen because he wanted to gain more power and kill the person who did it..