6:48 p.m. on January 17, 2013 (EST)
Don't know if this helps and those wind forecasts sound crazy, but here goes:
Been wearing softshell trousers and jacket for the last week or two, lately with snow and below freezing, winds around 10mph gusting 30-40mph (or felt that way!). So mostly dry and cold with significant windchill but nothing outrageous. This is about 800m max, along ridges etc.
I have worn mid weight softshell trousers (non-membraned) on the above freezing temp hikes. The only time I felt cold was when I wore a 150 weight merino base layer instead of the 200+ weight. So with midweight (marmot scree pants type) softshell top and bottoms, I had to wear a hardshell over the top in the beginning and after lunch, but only because the baselayer was too thin.
At freezing temps or below hikes, I wore the thicker softshell trousers and jacket, the jacket having a lightweight fleece-type lining in it (think it is called Patagonia Winter Guide, from five years ago?). All non-membraned. I wore a 150 merino and felt fine one day, and wore a 200 merino and felt warm only going up, when I wasn't even wearing gloves until I got to the top, it was so steep. After lunch/resting, I felt fine again.
Bear in mind I have lunch wearing a duvet/belay jacket and this stays on for half an hour until I warm up.
Summing up: for top half, 200 or 260 (the icebreaker bodyfit stuff?) weight merino and a heavier weight softshell is more versatile when it is snowing, as you can add the hardshell or subtract the softshell/vent the zips should you need to regulate. A thin baselayer means you never sweat but then you are never really warm enough, and if you have to keep the hardshell on because you are not warm enough, then why bother using softshell at all? For bottom half, I find warmer (not the lightweight fleece lined, such as Patagonia Northwall things, however) weight softshell is fine with the leg vents, which really work on the way up. Midweight softshell would probably be fine also but not below freezing with gusting winds. I never wear baselayer under softshell legs on the hill.
There are so many variables, I doubt the above is relevant but it may help you get an idea for how using a thicker softshell makes a hardshell a bit redundant but as most people won't leave home without it anyway, it serves as a backup warm over-layer before your belay/duvet jacket has to be worn. A hardshell being carried could always be substituted for the heavy softshell and that combo would be less hot, but I don't do that because I find my winter hardshell (Proshell) is too sweaty - I would rather have a wet back and and slow down my pace and vent than swap the softshell for goretex.
The one time I tried layering a patagonia R1 hoody underneath a softshell, I sweated too much.
Maybe they need a third category: Firmshell.
Have fun and let us know what you think. Oh, and if you get a pair of softshell trousers with the eyelets and lace hook, for making gaiter-bottoms for the snow, let us know how you get on with that - I keep forgetting to buy some shock-cord and making some myself, it would be handy to just loop the cord under the boots when there's a patch of deep snow, rare as that is in the UK (I hate gaiters, would rather pull snow from my boots every five minutes ;-) I do wear gaiters when the snow is deep and when wearing crampons to save my trousers from getting cut up.
Edit: as for the neoshell softshell (?) I don't have that but as it is already windproof as well as waterproof, it would act as if you were wearing two layers of goretex windblocker, rather than two layers of pertex or something like that, not uncommon in the UK. It just wouldn't breathe as well as a normal non-membraned softshell with a membrane on top, if you see my point. That is one reason why I don't see membraned-softshells as useful except for cycling in winter etc. But, one's mileage may vary.