I'm pretty sure the third gate will eventually go where it was always supposed to, on the old Lockheed Martin land, with bus transportation linking it to the main resort.
Universal sold the land off when Vivendi purchased them, but the developer who purchased it, Thomas Enterprises, seems to have suffered in the recession as despite great plans for 'The Boulevard', not a shovel of dirt has been shifted and the land is just as barren as when Universal sold it.
Here is an article on the fate of the guy who Universal sold all their expansion land to:
http://www.ajc.com/news/business/stan-thomas-an-atlanta-developer-with-outsized-dre/nQZ8J/
With all their extra cash, and with a fair amount of cleanup still to be done (it was a missile testing range so there was lots of toxic waste to shift - the job was incomplete when Universal sold) - no-one apart from Universal has the resources to utilise that land, so they should be able to buy it from Thomas, or the bankruptcy courts, or whoever owns it if Thomas sold it... maybe they already have, and we just don't know it yet.
If they do get that area back, Universal Orlando will have enough land to hold all the ideas and plans they can possibly imagine.