There's speculation that Zaslav will more or less reestablish the Snyderverse timeline. Building off of JL. It's been noted that the new Shazam 2 trailer features footage from the Snyder cut and not from Whedon's JL. The old regime would never have allowed that. Batfleck has been heavily pursued by Zaslav with Ben filming new scenes for Aquaman 2 and apparently the Flash. The Aquaman 2 scenes would have required a new Affleck contract. Gadot is reportedly just signed for new DC projects which belie speculation that Zaslav will do a total reboot - as in let Gadot and Mamoa complete their DC runs with their upcoming films and then recast and also not bring back Affleck. The first public announcement from WBD after the merger was noteworthy in its praising of WB films with a specific call-out of BvS. We'll see but signs are pointing to a rehabilitation, more or less, of the Snyderverse.