Immediately noticeable in the trailer is the art style of the cutscenes, which is reminiscent of the motion-comic style of Metal Gear Solid: Peace Walker, and, in fact, animated by Spooky Graphic, who also worked on that game. In this game, young Tatsuya accidentally kills a Yakuza and, to save himself, makes a deal to fight in an underground tournament. According to Andriasang's summary of the events in the trailer, each chapter of the game will end with one of these fights.
In actual battles, Tatsuya can be trained (leveled up) in ten different fighting styles, providing some variety to the game's frequent brawls. In addition, the new combat system, called "high tension," apparently no longer uses life bars. Check Andriasang for more details about the contents of the trailer, as well as new screens.