For an overnight trip, I'd for sure have a fluffy down jacket with a hood. Liner gloves (probably with an extra pair), fleece mittens, and overmitts. I'd want a thin, light hat (a buff works well) and a warmer hat.
I would wear a warmer polypro bottoms and shorts for pants, probably a smartwool midweight top and maybe a wicking tee-shirt underneath it.
My normal summer raingear doesn't have enough pockets for winter wear (think about climbing skins, waxes, that extra hat, overmitts, Clif Bars, &c). My experience is that wind pants are better substituted with goretex rain pants with side zips (bibs don't vent well enough for my taste). But I don't even like to go to the post office without a windshell.
Some people are fanatic about neoprene socks or other vapor barrier things.
If it is colder (like down to -25F) I'd probably consider thinner polypro bottoms and either Koch XC pants or a pair of Pattagucci Wind Shield tights, and a light fleece vest or fleece pullover top.
Most people screw up on sleeping pads. You need a lot more insulation of you are camping on snow. A full-length foam pad and a partial-length self-inflating mattress is a good starting point. You will probably want a warmer sleeping bag (although I've regularly gotten away with a 30-degree down bag in a bivy sack in conditions like you are expecting).
You'll need lots more food. Figure on twice the weight and calories per day you'd need for a comparable summer trip.
You'll need lots more fuel to cook that food. If you are melting snow for water you will need lots and lots more fuel. I usually figure on about three times the fuel I use on summer trips.
A beefier headlamp with lithium batteries is a good idea.
Then there is all that other stuff -- a snow shovel, climbing skins, avalanche transceivers, wax (both grip waxes and maybe glide waxes -- the new paste glide waxes from Toko are great), a scraper, a cork, and (of course) skis, boots, and poles.