Fan favorite (mainly for her bodacious animation) Mai Shiranui will be coming to Dead or Alive 5: Last Round, not as a simple skin, but a fully playable character. No other information was given other than a September release window, but considering Mai is a ninja in her own series, she seems to fit perfectly within the Dead or Alive ethos.
Team Ninja will also be releasing a set of The King of Fighters themed costumes for existing characters.