I will say, while of course it could just be a lighting difference on the camera, I watched the leaked POV and already one of the unthemed walls seemed to be covered much more, as well as some new projection mapping effects on the first Drac (the cape never appeared in any of my rides).
Also, just need to get this out there, something Unchained does exceptionally well and better than FJ is the feeling that you're the only one experiencing the events of the ride, except for the very beginning, when it actually makes sense since everyone is still on a normal tour at that point. When everything kicks in though, never once did I see any other ride vehicle, I was fully immersed in us being the only ones experiencing this chain of events, which especially for it being an always-moving ride, is extremely impressive.