Tekken 6 is out on the PS3 and Xbox 360 now. Someday, in the not so distant future, it will be on the PSP too with different features.
Online retail portal Rakuten lists some changes like story modes for new challengers Lars and Alisa. These two characters will have a new endings too. Gold Rush mode replaces the Tekken Force style scenario mode in the console version. In this mode you earn money when fighting which can be used to customize your character.
The PSP version of Tekken 6 is slated for January 14, 2010 in Japan and, according to multiple retailers, November 24 for North America.