It's hard to know since the ICON doesn't have soundings we can check to see what the whole atmosphere is like. The CMC today indicated more of a freezing rain scenario as well but I wouldn't trust any global with the p-type... the 3km NAM is usually very good at this as is the RGEM. The signals and synoptic setup certainly argue for a big ice storm right now but determining if it's zr or ip is something the meso models should help with when in range.
Thanks for explaining it?