This episode not only gives us the Shounen Club first appearance of A.B.C-Z but also of Nakajima Kento.
With Nakaken now on the program the creation of B.I.Shadow should be just around the corner as the group was created of the three Juniors that had roles in Scrap Teacher which aired in I believe the fall drama season of 2008. So I would not be surprised to see the group in next month's episodes. It will be a few years before we see any more members of Sexy Zone show up though.
We are also in the time period where most of the little/younger Juniors are now currently the older Juniors on the program. So I expect that there will be more and more to talk about as more familiar faces are seen.