Ok, my predictions then:
I think the range of the new NEOs or MAX will both be pretty similar and should give them the legs to reach into Europe, China, s.e. Asia & more of Africa, so I (sadly) think that there'll be no widebody's too.
I think the 320/321 combo would give them lots of flexibility with routes and loads and would be a great move.
But I also think the cost of bringing in a 2nd fleet and crewing it too would be high and detract from the streamlined simple business, and what with senior management coming from the Good Ol' USofA...
40 737 MAX 8's + 20 options is my guess. Possibly some 9's too.