I don't really know if this is true, but the LaLa company received a petition for a Season 3 and they approved. This person I got this from said its going to be next year, but they should have received a petition for Season 3 already considering the many petitions that was made for a Season 3.
I don't know when next year, but I'll check up on that in the official site and/or hakusensha.
Opps... really sorry for that, but it's just a rumor. T_T