Though in honesty the chances of a group being announced soon is really really really slim, IF they did it would be the biggest chunk of graduations from KSS since what 2011? or maybe ever? 2-4 for S/mileage, 1-2 for MM 5-7 for a new group so 8~13 graduating all around the same time.
That would be so bizarre to have so many go up at once, but so many of the girls are ready to be H!P debuts.