on DMM, after this event, the kamihime released are Shaytan, Malik, and Zabaniyah [similar to Perkele, is not released during an event! So Nutaku may release these Kamihime sooner than DMM's schedule along with an event with no Kamihime release.

My guess is that they are released with the Medusa rematch after the Christmas event, since Perkele was released along with Stolas, who had no kamihime release because the old limited edition's were re-released with her event.
For Medusa, the old limited edition's for New Years were re-released on DMM, but Nutaku may just give us Shaytan and the others along with the re-released L/E girls.