How do we get into the mind of a colony? They could be telling the queen, 'look this can happen' shape up or else. or maybe a faction plotting a coup de tat. With all the patrilineal that are in there, there are all kind of rumblings going on.I would say swarm cells...just to be on the safe side in early June!!
PS: Bees can't read so what is said in the books maybe completely different to what they have in mind.