The Wall Street Journal (Subscription required):
The original agreement stipulates the commitments undertaken by the two parties and relates notably to investments financed by the state and local authorities in transport infrastructure used by visitors to the park.
The new version of the text foresees new projects to extend Euro Disney, such as a planned vacation village project called "Villages Natures," in partnership with the real estate group Pierre & Vacances (VAC.FR), the people close to the matter said.
The original agreement was signed in 1987. My understanding is that the new agreement does not specifically call out for another theme park. It certainly doesn't place any contractual timelines on opening a new Park, like the original agreement.