Surprise! The game has been turned into a WiiWare title, due out next Tuesday (in Japan) for just 1,000 Wii Points. The odd fighter still features cooperative and competitive multiplayer modes, including Battle Royale, Flag Battle and Tag Match. All of these multiplayer game types are demonstrated in video on Nintendo of Japan's site; though with four small armies running around the tiny rectangular arenas, it's pretty incomprehensible.
Given its appearance as a retail title at E3 last year, Line Attack Heroes would seem to be a title Nintendo is interested in localizing. It'll be even easier to do so now that it's been transitioned to WiiWare.