Tekken 6 is a bit of a coup for the 360. The series has long been considered a Sony stalwart, and was PS3 exclusive until recently, so if MS has seen fit to wave cash at Namco to tempt them into multiformat-land it must be because the sixth outing is well worth having.
In terms of plot things are simple. Each combatant is fighting to become King of a tournament called the Iron Fist. Along the way you'll fight a panda, a man with unfeasibly large hair, and several insane ninja: as rich, character-led fighters go Tekken is one of the most established series' out there. The sixth instalment will see six extra fighters joining the line up including one who turns out to be the son of Heihachi, the PS2 exclusive character last seen in Soul Calibur 2.