Well Horizon 2 is definitely in development and while it could be a late PS4 title I think it’s more likely that it’s in development for the PS5. It’s pretty much the perfect system for the PS5’s first year.
Bloodborne 2 probably won’t happen this gen. Miyazaki and his team are busy working on Sekiro which started development back in 2015 right after the Bloodborne dlc was finished. Even if they start development for Bloodborne 2 right after Sekiro releases next year it’ll be a PS5 game.
The other 3 seem much more likely to me but Yoshida didn’t specify that the unannounced exclusive games he was talking about are AAA titles.