The GFS gets really ugly from about 150hrs with a massive dipole developing which, if it eventuates, will pump rubble out into the Barents Sea and Atlantic for the rest of the run, fed by a pair of lows sucking heat plumes from Siberia and the Mackenzie valley. Ice to 84N north of the Laptev is showing signs of staring to melt out already - the area at 84N between 105 and 120 will be one of the first patches to go.
Bringing up the rear, a third low(triplets!) sucks in moisture, loaded with latent heat, coming north from the NW Pacific monsoon.
The only cold is in areas with doomed ice, perhaps the cold indicates extra melt going on?
This is still way off, so treat with caution, but it would be diabolical if it works out, I've attached wind and surface pressure, surface temperature and precipitable moisture maps from a whopping 189hr out,