I wonder if the newer 950s have newer software. There's no way I know of to find out which software version (from Cirrus or ?) is in an individual 950.
Having new software loaded may be a concern when 950's start shipping again. I'd imagine the Outlaws won't want to emphasize any software updates, since that might encourage current 950 owners to request an cxchange to a new (hiss-fixed) 950 model.