The biggest gains for Apocalypse will be overseas. If the film is great then 850 - 950 m WW is possible. Plenty of momentum coming off DoFP.
Well Apocalypse will beat XDOFP total of 745 mil FOR SURE.
How much more it makes depends on the films quality i guess.
800-1000 mil probably. we ll see in 2 years. Maybe it does even better.