The real changes are more on the line of therapy (working with clients), hormone therapy (less gatekeeping) and informed consent in general (which is lacking in the surgery front). The guidelines on genital surgery and breast surgery haven't really changed a lot since v6. Probably the bigger question would be why refer to WPATH as the old name?
edit: I should clarify I mean informed consent not in the popular meaning of "no letters" but by the patient knowing all risks and options including no treatment.