Story
Following the conclusion of the King of Iron Fist Tournament 4, Heihachi Mishima defeated Kazuya Mishima and led him to Honmaru Temple, planning to let both his son Kazuya and his grandson, Jin Kazama, battle and steal their respective "Devil Genes." However, Jin defeats both of his predecessors and flies away, leaving the latter two unconscious. Shortly after, several Jack-4 robots invade the compound, programmed to take Heihachi's life. Initially, Kazuya and Heihachi fight the Jack-4s as a team, but eventually Kazuya throws Heihachi across the room as soon as he notices that Heihachi is getting tired. Then, Kazuya turns into Devil Kazuya and escapes, leaving Heihachi to deal with the Jack-4s by himself. They quickly overwhelm him and self-destruct, leaving Heihachi seemingly dead. The explosion however, revives Heihachi's father Jinpachi Mishima from his 50 year slumber chained up beneath the Temple, and proceeds to reclaim the Mishima Zaibatsu. A few months later, the King of Iron Fist Tournament 5 is announced. It turns out that Heihachi in fact survived the expolsion, and now pledges to find out and "break the neck of the one who started this ridiculous tournament!"
New Features
Over 35 stages are available in total, including new stages such as a redesigned forest stage from Tekken 3. Most of the existing stages from Tekken 5 have also been reworked, such as being set in different times of day, or with differing setpieces (The Burning Temple stage, for instance, is no longer burning, but is now an Autumn leaf showered arena) as well as remixed stage themes to match. The original versions of these stages are still available in the arcade version and unlockable in the PlayStation 3 version.
There are more customization items for each character, and for the first time Mokujin and Eddy Gordo can be customized as well. All characters are now available to begin with, rather than having to be unlocked by completing the game with each character. The default colors for all the characters have been changed (for instance, Kazuya's formal attire has been changed from purple to white and Jin Kazama's gym pants' flames are now red rather than white).
The player can customize the characters to don their original Tekken 5 colors. Hwoarang's footpads, which were previously unable to be customized, are now available to allow players to change their colors. All of the items from Tekken 5 are present, as well as a number of new items. These include auras which change colours depending how a player ranks their characters. All extra costumes from Tekken 5 are also present, and some have even been made customizable (such as Ling Xiaoyu and Asuka Kazama's school uniforms).
Many of the characters have new animations, which can be viewed before and after a battle. The three animal characters have had their custom color regions expanded/reworked, including color options for Roger Jr., Kuma and Panda's fur. These characters have more expressive facial animation (mouth movement for example).
Eddy is now a standard character, separate from Christie Monteiro for the first time since Tekken Tag Tournament (before Christie was introduced as a character in Tekken 4), with his own character select space and customization items. Armor King is a standard character with his own set of moves, sharing less of King's. All characters have new and balanced-out moves as well as some updated move commands. During battles and intermissions Jinpachi Mishima has an altered appearance, with a skin texture like veins of fire or flowing magma, and a glowing white horn protrudes from his forehead.
The selection screen and battle loading screen sport new CG renders of each character. Also, many of the characters have had the colors of their Tekken 5 outfits changed, and can subsequently be seen in the selection screen and the battle loading screen CG renders, as well as during gameplay.
Gameplay
Along with the many additions to the PlayStation 2 port, the Arcade Battle has been upgraded by adding twelve more ranking titles and removing one: Conqueror. Tekken Lord is no longer the highest ranking like it was in Tekken 5. Dark Lord is one ranking above Tekken Lord and the highest ranking is Divine Fist.
Divine Fist is only achieved by successfully completing all of the league matches, survival tournaments and ranking tournaments in Tekken Dojo mode. The opportunity is offered once a promotion chance is offered sometime in the Heaven Dojo, the sixth stage in Tekken Dojo mode. Obviously it is only offered when the player is ranked as a Dark Lord.
Another addition to Arcade Battle is that it now keeps track of the player's statistics. Each character has a clean slate once they begin playing Arcade Battle. During selecting a character, loading a match and battling an opponent, the player can see their alias, ranking, what region they hail from, their wins, losses and percentage.
Source Wikipedia
Some screens
