You need to go back and study what you saw again. The 4010, 4110 and 4115 from JD are similar in size to the BX, and have less structural integrity (Note that JD does not rate these machines for BH or PHD). I therefore will doubt whether a "smaller" machine is going to be beefier and still retail cheaper! What was on display was probably something else. Note that JD makes no reference to this new vaportractor on their site. It is reasonable to believe that one such tractor is on its way, I doubt that what you saw that impressed you so much was it.
Spare the 7 bucks, go back, post pictures.
Seth