A - They ship about 50 vehicles if not more to Michigan for all the NHTSA rating tests. The results are probably done just not published yet.
B- Range is done already for WLTP ratings for EU countries. However, I think the EPA numbers are being done as we speak. These numbers have to be officially completed before any sell of the vehicle to customer. Now they do not need to be released officially but they do need to be done and put on the Vehicle Sticker. But what you see on website is the WLTP number and EPA numbers are usually lower so I am waiting to see what the EPA says it will be.
C- the horsepower is not going to change either way unless they adjust something via a software update.