I for one would really like some greatly improved software, but right now, I know what I have and what you are planning is not too clear for me as well.
Faster diagnostic speed and better service.... Well better service is great and faster diagnostic speed even better but what is the rest of the story; what will change with the diagnostic software itself and what is the reason we are getting completely new software? Do notice the doubts of your users and explain better the reason of this upate?
Be aware this tool is very important for a lot of us and we are reluctent to do just anything with it that we are told to do since losing options and abilities will harm us directly.