They really don't care. In fact, besides Avatar land, Disney's been exceptionally loose lipped on nearly every project in their history. WDI people blurt stuff out with reckless abandon to superfans on a daily basis about a myriad of projects- many that aren't even greenlit.
People usually know everything that happening in Glendale/Burbank or TDO/TDA well before anything's announced. They don't try to keep secrets, it's all out in the open and you don't normally even need to sign an NDA when you're invited to the buildings where such things are being developed. Universal Creative is the opposite, fiercely protective of potential projects and crawling with NDA's. Which is ironic, because if any company has their plans made public before an announcement worse than WDI, it's Universal Creative.
Speaking of Avatarland though, just got a taste of the lighting/electrical lay of the land and I almost cried. People can't fathom how complex it's going to be but that's for another thread.