You know, apart from the shock of this announcement, I'm not expecting much. I doubt there will be changes. Genie was announced before Iger left. Reservations weren't his fault, but since the company perceives them to be of help, I doubt they're going anywhere.
Unless I'm misremembering, I don't believe there's been any indication that Iger was displeased with how Chapek ran the theme park division-if he had been, he wouldn't have been named his successor. Any negatives from Iger about Chapek seemed to stem entirely from how Chapek ran the company after Iger left.
And really, everything that came to be unpopular with Chapek's leadership was at least a side effect of Iger's strategies and priorities. Chapek's choices directly descended from Iger's. The bad ideas were just harder to notice when Iger called the shots because "the good Bob" had some level of charisma and knew how to sell things and talk to people. Chapek did not.
Any theme park-related epiphanies on their part are unlikely to occur, IMO, unless Bob takes a walk around a Disney park and suddenly cares about the poor shape the attractions are in, something that wasn't the case in at the very least Florida before he left.
Iger was explicitly anti-SATS from the getgo and, if the timeline of the Splash revamp matches what
@GiveMeTheMusic and others have said, it would have begun serious planning before Iger left the first time around. This is unlikely to affect Splash in the slightest.