Wii U version improvements:
Unique Wii U controls – During single-player mode, players can enjoy faster and more fluid action by using the touch screen of the Wii U GamePad controller to select weapons, execute Ninpo, see in-game information and much more.
New Weapons and Ninpo Types – Exclusive to the Wii U version, the game includes six weapon types and three Ninpo types, allowing for greater game-play variation and deeper strategy.
Character/Weapon Progression System – Using the Karma points earned during game play, a player can upgrade his weapons and Ninpo and increase the character HP level.
Faster, More Intense Battles – Improved enemy AI, the return of dismemberment, as well as new enemy types and battle areas have been added for greater variety in battles and increased replay value.
It seems that Nintendo was worried about this game and how it would do on Wii U if Temco by themselves released a port that was a cut and paste job from the 360/PS3 versions, hence the reason why Nintendo is publishing this game. By making improvements to the controls, AI and bringing back the gore from previous games (Why did they take out dismemberment before?) hopefully this game will be the true Ninja Gaiden 3 fans were hoping for.