I think this will be a better D23 than the last one in 2022 but expect it to still be quite muted compared to expectations. I am expecting the following things to happen either at D23 or prior.
Disney Cruise Line
Update on the Disney Global ship
More looks at the Disney Treasure
Animal Kingdom
Concrete Dinoland land designs with dates when it will begin construction. Not expecting a land opening date
More information about A bugs life closing and Zootopia refresh starting
Magic Kingdom
Country Bear Opening Date
Tianas Opening date
Pirates Themed tavern
New Orleans Square
New Blue Sky Concept for behind Big Thunder
Rest of WDW
I expect nothing for DHS or Epcot
Update on Poly Tower
Disneyland
Tianas Bayou update
Blue Sky Concepts about Disneyland forward
International Disney Parks
Updates on all foreign park construction
Announcement of a new land at one of the foreign parks
The only big thing I am expecting is for them to announce approved plans for the land replacement at Dinoland. I don't expect much out of a D23 besides being disappointed but this feels like something the last few years have led and will be their splash, so to speak, of the event. Besides that announcement, I only expect more blue sky concepts and updates on things either already in construction or finishing construction. So they can look good announcing the opening dates for Disneyland Tiana or Country Bears refresh and act like it was this huge announcement.