Well, Four Seasons is supposed to build something where the Eagle Pines golf course is, but I doubt they could be selling it yet. I'm also not 100% sure of it will have "on-site resort" status (i.e. EMH, transportation, etc.).
Perhaps its part of the Bonnet Creek development...I vaguely recall that Fairfield has taken it over and making timeshares - but it is not considered "on property". You do have to cross into WDW to get there because its surrounded by Disney property and I think I-4 on the fourth side, so it could make people think that is on property, but it is not on Disney-owned land. Currently they do not receive on-site benefits (although they could negotiate that I suppose).