Hector Martin who’s developing Asahi Linux for Apple Silicon recently tweeted about this. The M1 Pro, M1 Max and the at the time unannounced “Double M1 Max” have a completely different series identifier (T600x) to the forth coming Mac Pro chip (T6500) so no it won’t just be a doubling/quadrupling of an existing design. https://twitter.com/marcan42/status/1498317101245034502?s=21