I'll let you off as you donr have many classic minis over there
The BMW MINI (caps!) is a fair bit bigger than the classic mini (non caps) and weighs a lot more, tis an all new car, shares no parts with the classic mini at all. As for useage in the snow I reckon they would be fine, they are a nice car. There are no plans for a turbo version, but there is a supercharged version allready on sale, the MINI Cooper S, packs about 163 bhp I think.
As for VW busses, seen a few with porsche 911 engines in!