I saw this game while searching for some PSP new releases. It's release is next month. But that's not what amazed me. What amazed me was that this game was made by Namco Bandai. I can't believe that they made a game like this.
They had no games to advertise, so I'm guessing the sponsor cut the fund and they had no money, and no purpose. So they shut it down.
But we aren't sure if it is temporary or not, there is a forum that might have some more information on it. But I don't remember it it :P Sorry, maybe Naruto 321 might have some information about it.