Concepts do exist and they were originally planned to open up around this time to counteract the WWoHP. However, nothing is currently happening. Things are waiting the green, but I wouldn't expect them anytime soon.
No land clearing is happening at DAK. Both of the major expansion plots are already cleared from original park construction. Remember though, the Pocahontas show closing was suppose to coincide with construction on the original BK plot. Those plans were shelved.
Oh, calling Forbidden Journey a simple coaster is absolutely laughable. Nothing about it is even remotely like a coaster. Until you have ridden it, you cannot comprehend how unique and truly amazing the attraction really is.