Since it's been established that the expansion thread isn't for ideas, I'll post what I think Universal should do with their new land here.
Obviously, theres a few issues with Universal doing a third park--how to make it different from the existing two, how to deal with it being on a separate lot, etc. In an ideal world, their third park would solve both of these "problems"
For starters, the theme...what do you do that the Studios or IOA haven't? Combine them. Mix with the ride the movies mantra and the Studios' original love letter to cinema theme with IOA's hyper-theming and make a park around it. The main street area could be 1940's Hollywood, kinda like Buena Vista Street at California Adventure in the way it's set up. From there, have different lands themed to genres rather than IP's. I would do:
-Jungle area themed to 1930's adventure serials
-Sci-fi area with a 1950's retro future aesthetic
-Fantasy area, mountains, castles, all that
-Horror area, probably with an early 1900's/Victorian aesthetic to tie into Universal Monsters
-Modern day city area themed to action blockbusters.
Then how to deal with it being off property--simply don't. Instead of trying to create synergy between two separate resort areas, make Gate 3 its own thing. Dont rely on tried and true IPs. No Woody Woodpecker, no Harry Potter, etc. Have a couple non-Universal anchor IPs (Lord of the Rings being an obvious big one) and then use that as leverage to get some original rides thrown into the mix as well.
This could be Universal's Magic Kingdom...generic-enough theming to accommodate almost any new hot property that comes along (the time period themes would be almost exclusively aesthetic, only), but still true to Universal's original vision with plenty of room for some cool areas.