It is pretty clear to me that D's were first getting all the torque sleep variants of 6.1, which makes sense because the majority of the features were for D. Also clear that AP enabled cars (not especially D) were first to get 6.2 because of significant Driver Assist features. Before these two releases, it was much more random. I expect as we continue to get new hardware configs, updates will be rolled first to those cars that best exercise the features. In my opinion, if anything, the TMC "active poster" demographics skew to the older cars beyond their proportion of total population.