Professor Marvel's, aka the Wizard of Oz's, circus show thingy in the Kansas part of the movie would fit in at the Thunder Ranch BBQ area, and they used this area for a Pirate movie premiere, so I bet they put in a temporary display to help promote the film. I bet this is what is being discussed, though they also have the Lone Ranger stuff to promote as well. I don't think they'll put in a Wizard of Oz attraction in Disneyland, especially in Frontierland, considering that Oz has nothing to do with the Frontier. Though, obviously, the queue could be Professor Marvel magic show and sometime during the ride you are transported to Oz via tornado . . . still on parks maps it would have to be listed as a Wizard of Oz ride in Frontierland, for guest reference.
And also considering that the Oz film will probably only break even . . . Lone Ranger looks like it will be the tentpole next year, not Disney's Oz.