The manga has ended. The special here starts a new arc of the manga... but doesn't cover all of that arc...

Lots of people are speculating, but I think the only people right now who could answer you are the producers themselves...

If you're really insanely hooked on it, you can find manga scans around. The manga extends I think around 80 chapters past the end of the anime, but I could be wrong there, having not read it.

Torrents should be linked on animesuki's series page for it. You could also hit that ftp I spose .