I came across a thread where folks were discussing a new parts list for the 47/54-inch front snow blower that shows a gearbox in place of the existing chain and sprockets. The serial number break looks like 100001- for the 54-inch and 180001- for the 47-inch blower.
These new parts lists are located at the URL shown below. I'm not seeing anything new yet in Parts Advisor.
John Deere Parts Catalog
If you browse the new lists you will also see that they are now listing some individual parts for the auger gear drive. Not everything but it looks like some seals, bearings and a replacement gearbox cover is now available.
Part Number: AUC11644 Part Price: 494.71 USD On Hand: 0 Check Other Stores Description: Parallel Shaft Gear Drive - PARALLEL SHAFT GEAR DRIVE, ENCLOSED
They are also showing a revised up-stop with a redesigned drive shaft shield and a place to mount a cleaning tool. Although I cannot find any actual part numbers for these items.