http://www.pcgamer.com/monster-hunter-world-to-add-new-beasts-in-free-post-launch-updates/

Earlier this year, Monster Hunter: World's Ryozo Tsujimoto promised the incoming monster-collecting venture—the first to ever come to PC—will enjoy free post-launch updates. Now, the game's producer has revealed these updates will contain new monsters. 

Speaking to Japanese publication Famitsu (via Gematsu), Tsujimoto made the announcement in the wake of the weekend's PlayStation Experience livestream.