Somehow, I don't think they want to have a third park, which is funny.
If they would, they'd be clamoring for Garden Walk, and figuring out ways to appease the hotels, Anaheim, and the county. But if I had to think with the issue of the Eastern Gateway, Anaheim and the hotels are in no mood to allow Disney to expand towards a third park.
If anything, I buy USH getting a second gate now more than Disney.