Calling back the troops

Either a virgin queen left on a mating flight today or she left with a swarm.
Here's the hub-bub at the entrance to the nucleus hive. And below are workers calling in the troops in the aftermath sending their nasinov marker pheromones into the air.

I had a similar incident last year, but this season's is two months earlier. We've had an extraordinary spring with average April temperatures 3C above the monthly average.