I don't think there has been a period when WDI wasn't working on something. Marc Davis did a model which was *very* expensive, of Western River Expedition, they put in on Main Street, and it didn't happen. It is absolutely no sweat off of Iger, or the board's brow, if they give WDI money to dream up stuff and do concept art. In fact, they'd be negligent if they didn't always push WDI to work on stuff and come up with new ideas.
I think the reason is that when they decide to make an investment, they'll want construction cranes up in a year or so, and it takes longer than that to fully design a ride from conceptualization to final architectural plans. Witness Avatarland. WDI always, "stocks the pantry", with 'products' that can be taken down off the shelf and used in a relatively quick amount of time. Just look at 7DMT, the conceptualization for that started a while ago. Circusland ideas have been worked on even longer than that . . .
Iger is gone in 2016, does anybody really think he'll green light a project now, with so many on the stove top right now?
Nonetheless, WDI has practically announced that there will be some "hints" at the Imagineering presentation.