I think the most likely to be announced more..publicly, is Black Panther 2 and Guardians 3, considering they're seemingly the ones with names attached that we know of so far in the rumor mill (and confirmed in the case of GoTG).
Honestly..part of me is interested if Deadpool would be integrated into the D23 announcements, considering how Disney isn't just simply keeping quiet of their interests to the merc with the mouth (and with recent reports of the control now to Kevin Feigue and the Marvel Studios team, as opposed to 21CF'S).
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Speaking of 21CF, I am actually very interested to see how they're integrated into the Studios panel. Especially with The Kings Man, Jojo Rabbit, West Side Story, Free Guy, and Death on The Nile.