The eggs look like they're about to hatch very soon. I noticed that keeping pairs of queens together may not be 100% beneficial. One queen will lay eggs and the other will (while the other queen is out) dump the old eggs into the outworld. Then she will proceed to lay her own eggs, doing all of this when she's alone. When I place the eggs back into the nest, the queens accept them and clean them. Weird.
They should hatch soon... here's some recent photos;