Although its still Summer, Salsa Cycles is thinking of you with their 2011 line. What we have is the Mukluk, a hardtail known as the Snow Bike.
The 2011 Salsa Cycles Mukluk will take to the snow with its wide rims and tires (tires are huge!), add those two together with proper pressure and you will cut through the snow with ease. The frame geometry is also perfected for the snow, and is achieved by your usual hardtail mtb.
One thing you might think of while riding through the snow, is going at slow speeds. 2011 Mukluk is a comfortable ride even at slow speeds with its tall headstube, low stand over height, and lower bottom bracket height.
The 2011 Mukluk snow bike comes as a complete or frame only.