From what I understand(so massive grain of salt) the M4 line is going to be Kubota's upmarket machines in that space, kind of like how the L+MX and Grand L lines sit next to each other.
/ How brisk are new tractors selling in your area now?
The dealer called yesterday to see how the tractor was and to tell me about their open house. He they haven't had any tractors sit on the lot more than 90 days.