Animal Kingdom:
Indiana Jones Adventure, Encanto dark ride, Central American animals throughout the land Tropical America’s replacing Dinoland AND a Lion King ride for Africa, Zootopia show replacing “It’s tough to be a bug,” and a new night show with more fountains and drones.
Magic Kingdom:
Site work is to begin shortly for what amounts to a Frontierland expansion and more distantly, a new Villains Land the size of Galaxy’s Edge. Additionally, the Moana boat ride originally slated for Animal Kingdom will go in Adventureland between Pirates and Jungle Cruise. Tomorrowland Speedway will be different. Big Thunder Mountain receives an update. Stitch might not be in its current state for much longer, but it probably will not be announced at this D23. New Night Parade is pretty much a lock at this point.
Epcot:
Test Track redo opens summer of 2025, The Spaceship Earth update will likely be announced and will start once Test Track comes back online. I’d expect to hear one more announcement for EPCOT. Keep a close eye on the Figment project on Disney Plus. I've heard Inside Out will find someplace to go at EPCOT, but remember, some of these projects aren't as far along as others.
Hollywood Studios:
New land to replace Launch Bay. Rock n’ Rollercoaster retheme as well. Falcon mission update at HWS and DL.
Disneyland Resort:
New, unique Avatar land using the Shanghai Pirates boat technology at DLR. PeopleMover comes back in a new way at Disneyland Park alongside significant modifications to the land. Hollywoodland will go away. A Disney Springs-esque shopping district will likely be officially announced alongside plans for a new transit configuration for the resort. The Avenger’s E-ticket gets an actual announcement.
Walt Disney Studios:
Gets its own Avatar land and a Lion King land. Other misc. project in the existing part of the park.
Disneyland Parc Paris:
A larger than Soarin’ sum, so perhaps Soarin’/Soaring 2.0, Indiana Jones Adventure, or even a new version of Rise of the Resistance. I’d fully expect either a new land or two new rides including an E-ticket in total. Space Mountain will be back at DLP!
Shanghai Disneyland:
New Marvel Land, Toy Story Mania as well.
Hong Kong Disneyland:
Will get an E-ticket in Tomorrowland still, but I doubt they'll mention it at D23.
Plans can still change, but a lot of this should be announced by or at D23, some of this is long-term, though, and will not be included. Edited for clarity.