From the linked release...
Hyatt remains committed to its asset-light business model and intends to identify third-party buyers for Playa’s owned properties. Following the close of the transaction, Hyatt anticipates realizing at least $2.0 billion of proceeds from asset sales by the end of 2027 and expects asset-light earnings to exceed 90% on a pro forma basis in 2027.
It seems that Hyatt wants the brand/platform and not the physical assets so it's likely either (a) they'll sell off the Hilton branded properties to a 3rd party that may or may not continue to manage them as Hiltons, or (b) they'll sell to the adjacent Hyatt operator who would manage as Hilton until either the franchise agreement runs out on its own terms or they negotiate an early out
I wouldn't expect any changes for months if not longer, practically.