I think I can already can guess the answer but is there any support for concurrency for multiple users? My simple testing tells me the last person to press the save button will have their changes saved. If someone has made a change before the save is pressed then but after the edit form was loaded those changes will be lost (i.e. no optimistic locking).
I'm guessing this is probably out of scope as I don't even think WordPress has any sort of locking either, I might be wrong though.