Land in Manhattan? I don't think that even Disney could afford enough land in Manhattan to build a theme park. Besides, there's no land in Manhattan, unless the city plans on selling Central Park... and I don't see that happening!
If there are renderings of a new Disney park floating around, it's probably for India or China- two countries that Disney is known to have an interest in for their next resort.
I don't always agree with that site but that article makes a lot of sense. Disney is a very secretive company and I doubt they would let any cat out of the bag that soon. Besides, I don't see any new American resort locations (and by resort, I mean theme park/hotels/etc.), just new ones in growing overseas markets like China and India.