I keep hearing that California is getting it first too. Which makes sense because while they do have a lot of work ahead of them, it doesn't seem like nearly as much as Florida has to do to get it ready.
Seems like they could very easily have SW open mid to late 2018 and Marvel open in 2020.
Last I had heard was that Disneyland wants to get SW open as soon as possible. They've realized (thanks to Universal) that the faster they build something the sooner the money can start pouring in. And they know it will once SW opens.