I will let folks know how much I love my Pug in the snow... for ice riding I will use my winter bike which is studded front and back and runs an IGH.
A Pugsley is a great machine on anything but ice but no bicycle is... with disc brakes one could run chains on the stock tyres.
I know a good number of folks who ride their Pugs here in the winter on stock tyres but all have said ice is still ice and with such low contact pressure the fat tyres slip just as bad as any non studded tyre and spin out quite easily in the rear.