There's a honey flow on. All the hives in my out-apiary have stores now and there's a lot of activity. The bees are noticeably better tempered.
The roaring that I heard recently was probably the bees fanning, to cool the hive and evaporate excess water from the honey. I knocked on the side of A Hive this morning (the one which roared); they revved for a moment and then calmed down. Not queenless, just busy.