The D23 event is returning to Disney World's Contemporary Resort from Nov. 19-21.
Disneyland has 15,000 employees now, down from 32,000 before COVID-19 shut the resort down for a year.
The announcement comes off after months of relative silence about new offerings for Disney World's 50th birthday.
The 2021 edition of the SeaWorld San Antonio event will feature a brand new haunted house.
Universal Orlando said the HHN icon's "ominous and unrelenting presence will infiltrate every aspect of the event."
Magic Kingdom and Epcot will have their nightly fireworks shows back July 1, while Disneyland's "Mickey's Mix Magic" returns July 4.
The official policy states unvaccinated guests should continue wearing masks indoors and on all attractions, but Disney won't be checking anyone's vaccination status.
Sheer intensity and theming put Universal Orlando's latest addition in the conversation for the best coaster in the U.S.