10 different items were officially unveiled, though only half of them are actually big screen movies, the rest are series coming to Disney+.
Assuming that those 10 projects are the entirety of Phase 4, then that means Guardians of the Galaxy Vol. 3 won’t even be part of this next phase, but is actually waiting for Phase 5.
The officially revealed, and dated, projects for the next phase of the MCU start with Black Widow next May and run through Thor: Love and Thunder in November of 2021.