They just start transitioning them in either later in the year of 2015 or later in the earlier part of 2016. The "new" series of 70 series tractors isn't very old so just small changes will probably be transitioned in with very little notice. IF A NEW MODEL OR SIZE IS ADDED TO THEIR OFFERINGS they may do some promotional advertising which they are now doing on some bigger tractors. A series like the BXxx50 series will one day become the BXxx60 series with very little promotion and usually with very little changes. Not like cars at all. Year model of a tractor isn't as important as with cars, it's the series number and hours that make the big difference. Most people can say they bought a tractor on a certain date and it has so many hours and that tells the story for most people but there are some people that can't get past car years and really get bogged down on what year is it. Yes, I want to know the year if someone knows it but again the hours and then the series tells me most of what I want to know.