no they wont, I bought my version from someone and have upgraded already. And you can sell it again after that, but thats when upgrade rights are gone.
Why the hell do you want to know the engine version???? You only buy a license! This means that you are authorised to download a A7 Professional from the downloadsite. Never mind what version!
Because maybe he own A6 or A5 .
EDIT: My fault. he said that in the thread's title.