Sources: Screamscape and Bluesky Disney
Apparently the Shanghai suits love both DCA's Grizzly River Run and Universal's Jurassic Park River Adventure. They are giving the ride a highly immersive dinosaur theme, and may well feature drops similar to those featured at both GRR and IOA's river adventure. The working name for the ride is apparently Lost World River Rapids. The location is said to be toward the front of the park where the dark mountain is located to the right on Shanghai's sketchy concept art map.