With getting a hold on the volume 3 raws I’ve acquired info from the author afterword that KH will end at 5 volumes. Fourth coming out at the end of spring and fifth coming out in summer. It seems that Mizuki Nomura has either been hospitalized or is about to be hospitalized.
…I’m only reading through the afterwords ahead of time because I want to know when the next volume will be out, so by no means is this info completely correct. Well, actually, I’m at the same point in the story as you – the readers, so I’m unable to spoil anything. Note that! 🙂
Ah, just one thing. The play of the 4th volume will be Cupid and Psyche.