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Apparently the game is available in Japan already; here's a more detailed description from play-asia.com

Two playable characters – play as either a male character named Vent, or as a female named Aile

Biometal is the key – in order to gain the best transformation possible, strategically attack bosses without damaging its Biometals, otherwise its effects may become downgraded and must be repaired to regain its full potential

Transformations offer a range of different abilities

Real time info system – engages both screens of the DS system

Regenerating bosses – based on certain conditions, a boss that had been defeated will reappear again, allowing multiple opportunities to gain items from the repeated battles

Missions and Quests– progress the story by completing main missions while optional quests scattered throughout the map offer valuable information and items

In Rockman ZX, hundreds of years have passed since the battles between humans and Reploids (robots). After fierce wars between the two sides, peace was finally restored and the two groups were able to establish various cooperative nations within the "Inner" area of the universe. However, danger zones remained in the undeveloped "Outer" section where independently evolved robots called "Mavericks" began wreaking havoc. A group called the Serpent Company scours the Outer universe to provide energy created from otherwise unattainable items to the Inner population and also serves to protect these peaceful nations from Maverick attacks over the years. On an excursion to the Outer region, they discover relics of ancient technologies in the ruins. These relics, called Biometals, are living, conscious materials, with records of information and weapon data from history housed within.

Players assume the role of either a human male character named Vent or his female counterpart, Aile, who are employees of the Girouette Express, a courier service that takes jobs transporting anything to anywhere. On a job accompanying their boss, Girouette, to transport a package containing Model X and Model Z Biometals, they are attacked by a mysterious group of Mavericks who seeks to take the material for themselves. During the scuffle, the Model X Biometal is absorbed into the main character, causing a transformation into Model X form while the Model Z Biometal fuses with Girouette. Facing innumerable enemies, Girouette lends his newfound power to his employee and the two substances combine to formModel ZX. With powerful abilities at their disposal, they must discover who the menacing enemies are and what they are ultimately after.

Well, in the interview with the producer he was saying that he reccomended the guy story first, with the reason being that the girl one is a bit tougher and gets closer to the core of the tale.

New tidbit!

All the game's 'levels' are not truly levels in the traditional sense. All the game's areas are interconnected Metroid style. There arewarp poits to each area after completeing it.

Yeah sweatdrop I haven't picked it up yet. I don't quite have the funds because of...various reasons. Oh, I still have my Wii Funds (sounds so funny xd ), but this is a game I'd like to get soon. Game Informer, of course, gave it a "just slightly above average" rating rolleyes while generally insulting it.