Sadly, I doubt there will be a season 3, even if I would of course wish for it. But it just doesn't seem to be very likely... All we can do is hope.
There of course is a petition on the internet, but there is also one for translating the VK DS game and for thousands of other things and I don't believe in petitions...
Wht annoys me about the possible season 3 are the constant rumors. I mean, if there was one out already, we would all know about it. It's just the "fans" wanting to be sooo important to other fans because they "know more" and then they make up things like: the title and the direction of the plot. I won't believe in a 3rd season unless I see proof! What about pictures? Clips? Anything? If there was anything, Hino would have SOMETHING about it on her blog sooner or later, we would see a PICTURE and YouTube would have actual clips or at least previews - real ones not the fan-made mix of season 1 and 2. Not to mention if it was out in Japan, there would be episodes on the internet.
I of course hope for another season and there might be one, but there isn't one yet.