They hadn't announced anything, maybe it was a plan, but it wasn't official. And as far as I know, Hollywood Studios isn't getting Cars Land, they talked about it but I don't remember them ever officially announcing it and they didn't announce it at D23, maybe they decided to do Toy Story Land instead, because they announced that will be at Hollywood Studios. I don't know if Star Wars Land will be done by 2018, they haven't officially given a date, but I hope it's done by then.
You don't have to know anyone important to get privileged information. As a Disneyland cast member, I can tell you we sometimes learn things they plan on doing with the park years before they officially announce they are going to do those things.
"The past can hurt, but the way I see it, you can either run from it or learn from it." - Rafiki
"You must not let anyone define your limits because of where you come from, your only limit is your soul." - Gusteau (Ratatouille)