Earlier today new details for some new upcoming content for Monster Hunter World was revealed during a developer update for the game.
The first update reveals that the game will be having a crossover with The Witcher 3: Wild Hunt. The upcoming free update will feature Geralt of Rivia, who will be the host for an unique quest line in Monster Hunter: World. The free update will be available in Early 2019.
The final major piece of content that was revealed is a new DLC expansion called Monster Hunter World: Iceborne. The upcoming expansion will feature “new environments, new monsters, a new quest difficulty rank, new moves, and much more.” Monster Hunter World: Iceborne will available for the Playstation 4 and Xbox One in Autumn 2019. The expansion will also be available for the PC version of the game at a later date.
Source: Capcom, Monster Hunter