Here's my opinion on the matter --
Lately, I've been noticing the push Disney has had for focusing all of their attractions and lands on a Disney/Pixar film that has gone crazy at the box office. While I understand this, and I respect them for keeping to Walt Disney's original intention for the park, I feel that Disney needs to be publicly displaying more concepts for future creations that rely on their own unique theme. As we all know, many familiar and unfamiliar Disney movie enthusiasts equally enjoy attractions that are and aren't based around Disney films. I understand the need to keep everything as Disney-related as possible, but I feel that it's getting a tad bit overwhelming now, and something that is popular right now doesn't mean it will stay that way for a decade to come.
As for the Wizard of Oz Land, I really truly hope this happens. It would be wonderful if they could transform Disneyland's Big Thunder Ranch into the circus. It doesn't need to be themed around the upcoming movie, but rather be more of a nod to the new film. Detailed and precision is what could make this land visually spectacular. I could definitely see some larger-than-life Kansas circus action going on in an area that is so unused. As far as attractions go I'm not sure. Something thrilling would be preferred as both parks now have their fair share of mild and kid-friendly attractions. It would be great if the larger E-ticket attraction was in "Oz" (near the back of the land) with the Kansas circus near the front of the area. But, I'm not fully up to date on how much area is in the 'ole ranch.