Wowee Zowee indeed!
In a Nintendo Direct on September 4, 2019, several new floors were unveiled as areas for Luigi to explore: a pirate-themed restaurant, a dance hall, and the Tomb Suites, which boasts a pyramid and mummies inside.
Also, a new mode has been revealed called the Scream Park. This 4v4 party mode puts a team of Luigis and a team of Gooigis against one another to see who can catch the most ghosts, collect the most coins, and break targets.
Luigi's Mansion 3 is out on October 31.