Here is an Update From Disney:
With the expansion of Disney’s Animal Kingdom® Theme Park, we’re excited to give Guests even more opportunities to celebrate the magic of animals and nature as day turns into night. While we’d hoped to debut these offerings on April 22, unfortunately, they will not open as planned on that date as we give the team more time to bring these innovative experiences to life in a way we know will exceed our guests’ expectations. We’ll share more information about timing by mid- to late May.
This image from a recent rehearsal of Rivers of Light illustrates a bit of the beauty and complexity of this innovative blend of water, light and original music that brings with it so many firsts.