Maple Story 3D and Maple Story 2. Does not seem like a hoax.

If they bring it to America, I don't think it will last. (like Kart Rider LOL)

Kartrider more likely didn't last because a bunch of assholes from every other country (including ones that ALREADY HAD THE GAME) jumped into the game to be "pro" and make the game no fun for anyone else.

Everything said, I don't know how it will fail since tons of 3D games exist and they're all well populated.