I don't see how this effect can be dispersion, since all of the bands in that area are reducing in thickness; surely, if it were lateral collapse of piled-up slush then some of the surrounding areas would show an increase in thickness away from the peak?
From what I've read on here, it's most likely that this is some artifact and will soon go away (maybe surface water film, but it's been operating over several days, and I thought this area on nullschool and other forecasts was to have been staying way below zero at the moment - am I wrong?). If not, and this is upwelling warm water, then I guess we're stuffed. I'm a little anxious because it strikes me that this is the sort of mechanism that could explain Jim White's records of abrupt north Greenland warming in the ice core record.
At this stage, as jdallen says, we just have to wait and see if it holds up... nervously.