From artwork and official statements at D23 Expo,
Journey of Water Featuring Moana, Presented by Dasani seems to be a short walk-thru thing past water features and small waterfalls and pop-jet fountains themed vaguely to Polynesia but also the Earth in general.
I would classify that as definitely below the C Ticket experience of
Tom Sawyer Island with the rafts and big island/caves/fort to explore. I would classify it as slightly more exciting than the A Ticket of Disneyland's
Main Street Cinema, even after they got their butts handed to them by bad press a few months ago and had to remove the souvenirs made in Communist China and add some benches for good will.
But I'm not sure I could elevate it to the B Ticket status of a spinner like
Teacups or a
Carousel. It also appears to be less involved than the B Ticket
Swiss Family Robinson Treehouse (Orlando, Tokyo, Paris) or
Tarzan's Treehouse (Anaheim, Hong Kong). It appears to be a themed A Ticket walk-thru, although a good one like Disneyland's
Sleeping Beauty Castle Diorama walk-thru.
I'm sure it will be a fun 5 minute stroll, like Disneyland's Castle Diorama is. My concern is that it's being installed in the swamps of Orlando, and so within 30 days it is going to smell like mildew. And within 90 days the most complicated features will be broken and turned off.
And it will still smell like mildew.