My understanding is that it has nothing to do with the JB update and everything to do with the model of the phone that you have. Supposedly when they came out with the Razr Maxx HD and M, both phones were supposed to no longer have Webtop installed. That, and that alone, is the very reason that I will not switch from my Droid Razr Maxx. Further, I have seen information regarding people with leaked versions (I am still stock OS) that show that their Razr Maxx' with JB still have the Webtop software, even after the update.
That is what I have been holding out to see. I want to be able to continue to use my Lapdock 500 and I am counting on the JB update to still have Webtop 3.0. Unfortunately, and again this is my understanding, if you have either an HD or M, then you should never have had Webtop to begin with and therefore you should be (sorry for the abbreviation) SOL. If somehow it was on your phone to begin with, then the VZ promotions that indicated that Webtop would not be part of the OS for your device would have been been false. I doubt that was the case.