You should fully expect updates at D23 Brazil on the following:
- DHS Mermaid show re-do
- Monsters, Inc coaster at DHS
- Cars Land at MK
- Nighttime parade at MK
- 5th gate at WDW
- 3rd water park at WDW
- Detailed Disney Texas plans
- Home ports and destinations for the next 4 DCL ships
- Entertainment and shows on the Disney Adventure
- Massive EPCOT expansion
- Replacement of Kilimanjaro Safari
- Revival of Project Gemini
- Star Wars Launch Bay replacement
- Rock N Rollercoaster retheme
- Announcement of the new CEO
- 3rd park in California
ETA:
- Imagination v4
- Brazil pavilion at EPCOT
- India pavilion at EPCOT
- Mt. Fuji coaster at Japan
- Rhine River Expedition at Germany
- Mary Poppins spinner
- A revival of the MK Theater
- Moana Mountain in Adventureland
Sorry, but not sorry. This is going to be a giant nothing-burger yet people continue to believe that D23 events are these be-all-end-all parks announcements events.