>>2180885>So in other words we're still completely clueless about the future of the series.Not completely. Katabuchi is still very eager to make another season, and the only reason he hasn't started already is that he's waiting for Hiroe to move forward with the manga. So that means if Hiroe keeps writing the manga, Katabuchi will make another season as soon as he's ready.
Incidentally, if you want to ask him something yourself or just see what he answers he gave to other questions:
http://www.reddit.com/r/IAmA/comments/1z4le0/hello_reddit_i_am_sunao_katabuchi_director_writer/ 