Not yet. It is an area of interest, but it's also an extremely expensive area of interest for such a young business. I'll keep you posted here should things change or progress further.
I do highly recommend My Backyard Tours for winter clothing rentals, and I do believe it's about as good of an investment as you can make. Especially for those of you traveling from places like Australia, where, you know, a goose down jacket will never, ever be of any use to you. You will want to make arrangements with Margaret well in advance however, since renting winter clothing is a popular option among all tourists visiting Yellowknife in the winter months.