Yes AeroMexpress is also going to be sold. But they still don't know how they're going to sell it. Been told they're studying to merge it with AM
or sell it apart. OTOH, Mexicana Cargo is apparently re-launching their cargo division with their own planes! About time I think! Mexpress will only fly B767s, which I think it's a wise decision considering MY
and AeroUnion flying B767s and A300s or the rest of competitors with B744s. I don't see them getting B737Fs, it's too small in case they want to be face to face with the rest of the airlines.
Answering your other Q, nope it's not it. This one wasn't expected by any of us. There still another mexican carrier interested in bringing the 767!