During the special Monster Hunter: World broadcast today, Capcom announced that the upcoming game will have a third beta test featuring all three quests plus a new one that lets you fight Nergigante.
The open beta test will be held from January 19 at 11:00am JST to January 22 at 10:59am JST. Capcom decided to have another beta test thanks to fan demand.
Monster Hunter: World releases on January 26, 2018 for PlayStation 4 and Xbox One. A PC version will arrive this fall.