I don't think that this is the plan - though it should be. BRB just makes more sense than 'Lady Thor'. Thor is a person and not a mantle. I also don't wanna see Mjolnir back in the MCU since they accomplished everything I wanted (and more) in Endgame, by having Thor dual-wield his weapons, and Cap pick the hammer up.
Initially, I didn't even realize that these 10 announcements are the entirety of Phase 4. Those TV shows better pay off for 'em, because that is a total buzzkill of a full lineup.
With MCU lookin' to be in the pits from my perspective, and Worlds of DC doing really nothing soon, I might just take a break for a few years from comics book movies. Maybe catch up when Fantastic Four, X-Men, and the next Spider-Man come out.