If you'd like my theory, I don't think it will happen today either, it will probably most likely happen at the end of the battle pass season, which will correspond with the end of
the current event quest line in Save The World.
The date to look out for is the end of the Battle Pass Season on April 30th 2018, this coincides with the end of
the current event quest line in Save The World.
Not exact matches
Current and upcoming Challenges
Quests, including intermediate and expert along with Slay
Events are also listed.
The latest Monster Hunter World schedule also lists
current and upcoming Challenges
Quests, including beginner and intermediate along with Slay
Events — some of which run into June.