Thor finally updated their Class C web pages, as well as some of the Class A.
Other than listing new V8 engine (and they are listing the Premium instead of Economy version), I didn’t notice any significant changes in smaller motorhomes ; most floorplans look the same or similar. Maybe they are saving innovation for new upcoming Hymer division.
I haven’t seen any pictures of 2021 Class Cs on new chassis at dealers yet, but have seen new 2021 Thor Class As like the Ace. Other than new dash with steering wheel controls, only the revised engine doghouse stood out to me, but I don’t follow these large motorhomes closely so I may have missed a lot.
Its difficult to say from pictures, but doghouse looks about as wide as before but perhaps a little lower at back to make it easier to step over, with cup holders relocated. Below are before and after pictures for comparison.