I believe the difference between old administrators and new game masters is rather minor. GMs still handle all requests, process them and tend to other in-game and game-related matters, as well as enforce the rules and regulations. The only difference I can think of is GMs having moderator-level access on the forums, which makes developers responsible for editing and creating subforums, changing user groups etc.
As there's only 2 GMs, the internal structure is basically non-existent (besides GM/moderator separation within the department) and we try to handle a variety of requests and tasks so we learn how to process them properly and perfect ourselves in doing so.
If you are interested in the structure of the whole team, it'd be best to ask developers to receive the most accurate information. But their structure has remained similar to old one, with an addition of GM (which includes moderators) department and some new blood within their ranks.
