While I was at IOA on Thursday and Friday last week I stood over by me ship and tried to get a good look at the exit of launch 2. There's definitely something that is clearly being worked on at the inside wall area of the tunnel. Can't say with any certainty what exactly I was looking at, but it kinda looks like windows as viewed from the inside of the tunnel. If I were speculating, I'd say there's a possibility of some sort of effects that will follow the train to the end of the tunnel. But it's purely just a guess. Could also just be for lighting. If anyone knows more and could elaborate, please feel free.