I don't believe there will be any screen dropping effects that the guests will see from the tram vehicle. The Musion room will have individual screens to show the same performance for each tram car. Curtains (or walls) will separate the individual screens from the other tram cars. Musion requires a narrow field of view to work properly and therefore the effects loses its quality if it were in one large room.
There is a lot of speculation with this attraction at the moment and I feel that many elements, although true, are getting mixed up and over processed. I feel that we should think a little more practical and everything will map out more simplistic. However, I have been wrong before!!!
My guess would be that there are no practical effects in the large room similar to Kong 360.