The reveal came at the end of a virtual press event which Disney did not allow media outlets to record.
The park will reopen with only one of its coasters, Electric Eel, in operation.
Blue Bayou will become the second location where the general public can buy booze inside Disneyland.
The park will reopen with a new dark ride, Secret Life of Pets: Off the Leash.
The expansion could potentially include new lands in Disney's two existing Anaheim parks and a new shopping, hotel and dining district.
The dueling waterslides will first debut for passholders on April 1 and 2.
The Carlsbad park will reopen for "Park Preview Days" from April 1-12.