I am really curious to see what we get in terms of stage. I would like to see a futuristic neon city with some Japanese influences to bring both Somewhere in Time and Senjutsu into one single setting. A bit like the image below. Maybe some tower-like structures like the Japanese temple during Legacy '22 or the sattelite towers during the Final Frontier tour. This way they only have to change the curtains in the background and it still fits the theme perfectly.
They could also opt for the Legacy of the Beast route and change the stage to match the songs they will play. During the Legacy tour in 2019 and 2019 we saw the stage change from War > Religion > Hell and in 2022 it became Japan > Religion > Hell which was pretty cool and (correct me if I'm wrong) the first time ever that the whole stage changed scenery instead of just the curtain in the background. If they do this during the Future Past tour I can easily see them swapping a futuristic theme with the Japanese temple theme we already saw in 2022. But this would also mean that the setlist would be very divided, meaning we would first get 5 Senjutsu songs and then 5 Somewhere in Time songs (or vice versa of course) Would that work? In my opinion, no. I would rather see them alternate between SiT and Senjutsu songs and some classics (like The Trooper or Notb)
I would also like to see a making of DVD of this tour, like the documentary on the En Vivo DVD or the Flight 666 DVD. I don't know how likely it is that this will happen, but I would love to see it. I think there is a possibility since Steve regrets not filming anything during the Somewhere on Tour in 1986/87.