From Destructoid: “As part of a summer crossover event, Capcom is sending Rathalos to Final Fantasy XIV, and Square Enix is lending Behemoth to Monster Hunter: World. I’ve been anticipating this stuff since it was announced, but the timing has been somewhat nebulous so far. This week, Capcom provided a little more clarity.”
Source: N4G PC Final Fantasy XIV's Behemoth won't hit Monster Hunter: World until August