Monster Hunter World will be receiving its first major expansion in the latter half of 2019. The announcement was made via a new trailer that shows a team of Monster Hunters pursuing a dragon escaping across windswept seas to a new fog-enshrouded island.
Players can look forward to "new quest ranks, locales, monsters, moves and equipments" and the storyline takes place after the events of the main game.
Those are about the only details we know, but we'll be sure to keep tabs on it going forward.