https://www.gamespot.com/articles/monster-hunter-world-will-add-new-monsters-as-free/1100-6455553/

Capcom had already confirmed that Monster Hunter World will receive an assortment of DLC following its release, including a set of Horizon: Zero Dawn gear and Mega Man armor for your Palico. That won't be the extent of the DLC coming to the game, however.

In an interview with Japanese publication Famitsu (via Gematsu), Monster Hunter producer Ryozo Tsujimoto revealed that Capcom plans to continue supporting the game following its release by adding new monsters. Tsujimoto didn't share any details on what kinds of monsters players can expect or give a time frame for when they will arrive, but he did confirm that the monsters will come as free post-launch updates.