Monster Hunt in China is near $350M now. The Chinese government extended its run for a month, so it looks like they are pushing for it to take Furious 7's Chinese box office record of $392M.
Fantastic Four is going to lose 2000+ theatres next weekend, so that will almost certainly happen. F4 would need to have a 50% or better drop to have a decent chance at beating Ant-Man next weekend. Go look at the 3rd weekend drops for comic films that had F4-like second weekend drops.