All my ideas are pretty blue sky, because let's face it after MW's new coaster it'll be a long time before any big new areas get built anywhere at Village. Everything I've got is pretty vague too so don't demand details.
At Movie World I'd love to see an area themed to Animal Logic, that's the Australian studio that made Happy Feet, Legend of the Gaurdians, and the Lego Movies. Think 'Pixar Place' at DHS and you've got the general idea. Placement wise I'd like to take a page out of Universal's book and change the layout of the studios to give the park more room. This would involve moving the admin/reception for the studios towards where the actual entrance of the studios are, instead of so close to the park, as well as replacements for sound stages 1 and 2 built further away from the park, allowing the show stages to be used as a big show building for a big new family ride (not thrill ride, not kiddie ride, family ride). I think Lego batman would provide a great transition between the DC area and the Animal Logic area, and having dedicated family areas on opposite ends of the park would make it feel much bigger.
Animal Logic aren't a household name yet, but a couple of their movies are already classics, distrubuted by Village and WB. It makes so much sense, if they keep going the way they're going I think a themed land dedicated to their movies could be great.
At Sea World obviously I've detailed in the past what I'd like to see. After that I'd like to see the area around Jet Rescue be themed to an 18th century port, the kind where tall ships are going off on adventures to discover the world and there are all these fanciful stories of sea monsters and the like. The coaster I've detailed previously would fit into that theme, and given you'd be looking 10/15 years in the future you'd be looking at Jet Rescue's land with the view to a ride that takes you on an adventure with one of the early explorers.
At Dreamworld I've long advocated for a dark themed land, taking over Blue Lagoon, something akin to Alton Tower's forbiddian valley. After this year I don't think there's an appetite for that quite some time to come. What I would like to see is a back to basics Gold Rush country, a mine train and a chute the shoots. Rather than being themed to an abounded historical site like Gold Rush is now, I'd like to see it look like it's a mine that's still in use; like you've traveled back in time. One of the things Dreamworld copped flack over lately was that the area Thunder River was in looked run down. We know that was the theme, but I don't think Dreamworld should do that theme anymore. Modern mine, maybe give it a bit of a steampunk look and I think you could end up with something.
Again, Blue Sky, very vague, but you can kind of see how I'd be shaping the parks.