@Jamberoo Action Park has revealed it's 1st teaser of the new high thrill water raft ride which mainly gives clues to the theming:
If the gif is not visible, it says 'COMING SOON...THE PERFECT STORM...JAMBEROO...where you control the action!' - the latter 2 phases being the Jamberoo Action Park logo, which is permanently located at the centre of the bottom of the image. The first 2 phases alternate in appearance in large bolded font (with some letters featuring clawed edges) in the upper 75% of the image. Inside the first 2 phases is a cartoon image of a black/grey tornado hitting one of the back corners of a rusted corrugated galvanised iron-roofed wooden building (with a concrete chimney) while picking up parts of the building's roof, a bus, farm animals including a sheep, a cow, a cattle dog and a horse, a Model T Ford ute, a tractor, an utility pole, an outhouse, other debris & a cyclist (with bicycle).
So it looks like a 'tornado hitting a farm/country town' theme.
Whilst a Tornado ride already exists at Jamberoo, it indicates that the Tantrum Alley portions of 'Cockatoo Gorge' are still and now the most likely high thrill water raft ride to be Jamberoo's new ride as a Tantrum Alley is a series of miniature Tornadoes so a 'tornado alley' theme could apply.
In my opinion, I feel confident that this teaser answers the 3rd question but I would add another question in it's place: 'Is a Tantrum Alley the only feature of this top secret new high thrill water raft ride?'. Remember, a Behemoth Bowl was originally planned as the 'finale' to 'Cockatoo Gorge' (which originally was a Tantrum Alley/Behemoth Bowl hybrid) until Jamberoo Action Park confirmed exclusively on Parkz that they are no longer incorporating the Behemoth Bowl so is there a new type of 'finale'?
It also makes it highly unlikely that 'Cockatoo Gorge' will still be the name of the Tantrum Alley. So far, 'The Perfect Storm' is the closest thing to a ride name but currently it is most likely just a marketing slogan. More confirmation would be required to determine if it is the ride name so that adds a new question: 'Is 'The Perfect Storm' the name of the Tantrum Alley?'.
So the 4 main questions for now are:
Is either 'Koala Creek' or 'Platypus River' still part of Stage 2?
If one of the above is still part of Stage 2, which one has been delayed - 'Koala Creek' or 'Platypus River'?
Is a Tantrum Alley the only feature of this top secret new high thrill water raft ride?
Is 'The Perfect Storm' the name of the Tantrum Alley?