What should I consider when looking at a recumbent trike for commuting and winter riding?
I've commuted in the pacific northwest for two winters, and have equiped my bicycles with snow tires, mudflap extensions, and sewn bright yellow waterproof blankets to cover up my Xtracycle deck. A lot of my inspiration has come from the Winter Riding forum on bikeforums.net. I cannot provide model information, but possibly these some areas to consider:


are you considering a recumbent orientation because of chronic back or neck problems? 
A recumbent position might actually reduce core strength, or it might place stress on the wrong part of your back
storage and transfer at home and destination: do you want your trike stored curbside in all weather? Trikes are slow to fold, unwieldly to carry, probably more difficult to maneuver up stairways or elevators, and...like cargo bikes, not intended to be put on a bus...or maybe even trains
orient your budget towards all the gear you will want to outfit your trike with for wet weather commuting, plus ice plus snow. Studs are important for ice, studs don't help with snow, fenders don't help with snow, but you want them for anything wetter than slush
visibility: flags, extra blinkers
commuting plus cargo? Consider aluminum "Pelican" cases for secure alternatives to panniers
recumbent seats in wet weather often need to be covered with trash bags because the ones with foam pads become sponges 
snow and trikes is much higher friction than snow and bikes. General wisdom for up to 7" of powder is thinner tires (19-23mm) cuts thru powder with the least friction
clearance: if you have mobiliy issues, a higher trike will be easier to mount and dismount; if you do trails or want to clear snow mounds, clearance will help. This might dictate your tire size.
maintenance and support: some trikes come with rear suspension (springs or shocks) and those, like on MTBs, wear out and can be degreased in the rain; many bike shops do not want to support recumbents because its a fringe market and their suppliers don't stock parts for Catrike, Rans or Sun, you might need to be your own mechanic
try before you buy: I own a  used Rans Tailwind and I commute on it, but it's a hassle to make normal bike parts, like pannier racks, fit on them. I didn't know how many options there were for recumbents and I ended up with an ill-suited commuter: it turns out I wanted a short wheel-base recumbent and possibly a non-foam seat plus a windshield so I wouldn't be so bothered by the rain. If you have a local 'bent dealer that can help you setup different models with a wet weather loadout, you'll likely find a quality model that suits you
attachment points: can you attach extra battery pack and lamps for an extended lighting system, computer/iphone/gps unit
electric boost opion: Lightfoot cycles is an example of a 'bent manufacturer that does recumbent e-assist bikes, there are others. If you have significant hills to climb and you're used to standing on your bike pedals, that's something a 'bent takes away from you


Best of luck in your adventure finding your future commuter!