From all report I have read nothing has really changed except it sounds like tesla is measuring with rollout where on that model they measured without rollout before. Said another way, the upgrade is the same, and you are either at 4.2 or 4.4 now depending on whether you measure with or without rollout.
@Knightshade has linked to a chart before that shows the speed of the various models, but the TL ; DR version is, nothing has changed with the upgrade, just how they measure it... at least that is what I remember. I have a Model 3P so dont follow that very closely but thats what I remember reading.