Mario, Zelda, Metroid, Kirby, Sonic, Pokémon, Donkey Kong, Star Fox, Xenoblade etc. Nintendo has a huge collection of IP's with endless possibilities.
While Disney is taking forever on Star Wars and whatever that other one was that had people in blue cat fursuits. Universal has expanded Harry Potter, created Transformers, returned King Kong, and is now bringing what could possibly be plumbers, a hero of time, and pocket monsters to catch!
If there is another super-sized property for Universal Studios besides LOTR, it's definitely Nintendo!
Now the question is where will it go, three places have been speculated about.
Toon Lagoon at Islands of Adventure, home to IP's that NOBODY remembers.
Marvel Super Hero Island also at IoA, Disney now owns Marvel I don't think Universal would allow rights east of the Mississippi to slip, Star Wars was enough.
My most wanted for demolition would be KidZone in Universal Studios, also with IP's that not many remember. It's home to the worst thing at Universal, Barney the pedosaur!! !
It is also possible they could pull a Harry Potter and make it across both parks, warp pipes?