It's nothing new, but it's new from an OEM. Belt drives have always been after market. This is obviously a kids sled from start to finish. The seat, skis, handlebars etc have nothing to do with the patent, filing paperwork. So you can be assured those are just there to give the impression of a snowmobile as they have nothing to do with a new sled. The tunnel dump exhaust is an aftermarket design as well. We have not seen that from an OEM.
My guess is the combination of belt drive for low noise, and tunnel dump exhaust on a kids sled makes sense to get it behind the rider. Obviously these are all guesses. I'm 100% in agreement about the luggage rack. that's pretty common on the chinese four wheelers.
Who knows, maybe this design is to compete with the Yamaha Bravo? It may be the next version of a Bravo, as the extra rack strorage, small displacement, and tunnel dump exhaust for additional racks on the back. It sounds like a fisherman's special. Quick trivia, when was the Bravo released and when was it changed other than BNG? I have no clue, but it's probably older than my daughter.