So i saw an arc in the last frame of slow wing' animation, this shows it too.
It's harder to miss than see, but low left. It's point of origin seems to be shown here, just west of 150ww/78n, an upwelling, caused by earlier wave action, with already developed concentric rings/openings moving away among the chaos.
Looks like it's going to persist
I'm guessing that the waves generated here will sort the ice by size, pushing lighter fractions south in windrows between swells to melt, within the pack we have to wait and see just how deep the stirring goes.