Done playing Tenchu 4? Now check out Tenchu San Portable :) It looks like the game From Software is teasing right now is the second port of Tenchu 3, which first appeared on PS2 and later Xbox 360. The game will be out this August in Japan.
Update: Apparently, we are in for more ports from the company. Armored Core Silent Line Portable (Nov 2009), Tenchu Kurenai Portable (Jan 2010) and Armored Core Last Raven Portable (Mar 2010) are all announced somewhere in the mag. Also, Fu-un Shinsengumi: Bakumatsu-den Portable, the featuring the design of Metal Gear Solid’s Yoji Shinkawa, is set for release this December.