Tecmo Koei has announced that Ninja Gaiden Sigma Plus will be launching on Vita on the 22nd February. An extension of the PS3 title, Plus will take advantage of Vita’s touchscreen, gyro sensor, and the rear touch pad.
An example of this would be toggling between 1st and 3rd person views, using the gyro sensor to target your enemies and shoot projectiles, and launching stronger Ninpo using the rear touch pad.
I remember playing through the PS3 game and it was certainly a stiff challenge. Hopefully these new tweaks will improve the game even further.
Source: Press Release