The question is how much cleanup is needed on the land. I know there was a round of cleanup on it years ago, but if it needs more that could take a while.
If they have real, concrete plans ready to go and there's no additional cleanup necessary 2022 is a real possibility. IoA, CityWalk, and the resorts only took 2 years to build
A year for cleanup/land prep and 3 years for actual construction is a 4 year timeline. If they start next year we get a new park, hotel and CityWalk for 2023.