I've been having a little ponder - here's a list of lands which either could happen or are rumoured to happen, and what rides could fit in each possible land. I've only been to the Hollywood and Japan Universal parks, so bear with me! I'm no expert.
Jurassic Park
A Jurassic Park River Adventure, those are absolute classics!
Something similar to that amazing-looking dark ride in Beijing.
A rollercoaster features on the concept art, it looks like a B&M. I suppose a wing coaster would fit but speaking for myself, I'm not feeling too warmly towards that model after suffering through Mandril Mayhem, and Rapterra looks very shaky from off-ride footage. Maybe a flying coaster like in Japan? I did that one, it was ace!
Paddington
Some sort of kid-friendly dark would work well here. Maybe a journey through London or a boat ride through Peru?
It's not all about coasters but you could fit a nice junior coaster here.
Back to the Future
In the concept art that looks like a Back to the Future Intamin launch coaster.
A dark ride of some sort would be cool!
A transport ride themed to the flying cars of the future maybe?
DreamWorks
I think an Arthur-style Mack Inverted Powered Coaster would be perfect for this area, if it indeed happens.
A few kid-friendly flat rides, maybe a more traditional family coaster as well?
Several shows featuring the characters.
Lord of the Rings
Ooh, there's a lot to think about here! Maybe a Splash Mountain-style water ride with dark ride sections?
Or a Mines of Moira ride, either a mine train or an RMC?
A flying theatre themed to the infamous eagles?
A dark ride taking you through the world, maybe one themed around Gollum exploring the mountains?
Maybe an Escape from Gringotts-like indoor rollercoaster that's mostly a dark ride?
Like I said, lots of possibilities to float here!
James Bond
OK, this is my favourite movie franchise so I would adore this to the high heavens!
A Forbidden Journey-style dark ride where you move through a James Bond story.
Alternatively, one a bit more like Amazing Adventures of Spider-Man, but I think there's so much storytelling potential with a James Bond Dark Ride!
Or alternatively alternatively, a drop ride / lift-themed ride a la Tower of Terror and Battle at the Ministry?
A launched coaster themed to a car chase, maybe a Mack coaster like Stardust Racers?
A stunt show.
Minions
Oh do we have to?! Illumination are such a lazy- of course they have to, regardless of the quality of the films (or lack thereof) these movies are box office megahits.
They might replicate Minion Mayhem.
A shooting dark ride would be a really fun thing for the family.
A small family coaster if they want a coaster for this.
The Fast and the Furious
There's no hint of this in any rumours, but it could happen. This is one of Universal's biggest franchises, after all. Obviously, the critically panned Supercharged should not be included!
A stunt show would be a lovely fit here also.
A Radiator Springs / Test Track / Journey to the Centre of the Earth-like ride system would also be good.
Sorry to suggest a launched coaster once again but yes, a launched coaster would be the obvious choice here.
And... yeah, that's it. A bit of an unstructured ramble there! Anyway, would be interested to know what you guys think!