I have always thought a summer hire for a GM was most likely. But I haven't seen any such announcement, and what I've seen from MS feels more like thoughts of general likelihood rather than anything definitive. Obviously as we get close to the TDL, the idea that the Mavs won't have a GM by then is more and more of a default idea, rather than something they've said.
* Dumont reportedly "has no problem going into next year with a healthy AD and a healthy Kyrie with Cooper Flagg and seeing what it looks like."