Some additional details of the new parks were offered during the recent "ground-seeding" event. You can check out the annotated map in the Singapore "Others" gallery. Some of these details are not finalized yet and are subject to change.
Bird Park
It will comprise 9 large walk-in aviaries - Tropical Valley, Crimson Wetlands, Songs of the Forest, Jewels of the Forest (5 adjoining aviaries) and Dry Forest; an enclosed Amphitheatre for free-flight bird shows, an indoor Sub-Antarctic penguin display, a section with individual/communal aviaries and a large children's playground.
Rainforest Park North
It will feature the different stratum of the Southeast Asian rainforests. Key features include the Cavern (underground recreation of cave habitats), Forest Floor and Watering Hole (ground level paths), Majesty of Trees (elevated boardwalk) and Canopy Swing (elevated boardwalk through primate exhibits). Wall of Life is an open-sided building that runs along the North border of the park and will house small exhibits of herptiles and invertebrates. There will also be adventure courses.
Rainforest Park South
It will house a camp site and a native wildlife rehabilitation centre. The rest of the park is meant to be viewed from "Skypods" - mini monorails that travel along an elevated track. The Skypods will pass through enclosures with free roaming large mammals, as well as predator habitats.
New link to the concept video that has been re-uploaded with minor changes (images for the indoor nature-themed attraction replaced).