Wasn't he planning a return to 147 regardless of the outcome of the Martinez rematch? Don't know if he can effectively make the weight still but he's been pretty adamant that he can, so maybe he knows something the rest of us don't.
If so, Berto would make sense but Haymon don't play that in-house game. So who knows? Maybe he'll decide on 154, doubt he'll be at MW again any time soon.