I have no idea what the author's been doing since the series ended, outside of consistently releasing Imas CG Rina/Natsuki doujins every comiket and posting live twitter reactions to and gay comic strips about Aikatsu and PriPara.
I only just recently finished reading this... Going back, it funny how the first time you read this, the ending arc seems to come totally out of nowhere. But after going back and rereading it now, the revelation about Noriko's magical lineage suddenly makes sense in hindsight. I'm happy with the ending, though I wouldn't mind a sequel of some kind.