I find it weird that despite only 1 stage having destructable environments you can see remnants of that stuff existing in other stages, like the Forgotten Waterfall having that Cave on the left.
Yeah, they're in many stages, and the fact it varies from left side to right side reinforces my belief that the stages were all originally designed to be dynamic in 2 ways (day/night AND extra areas), and that Capcom will eventually "fix them" and call it an update (which I'm fine with, tbh). I actually think this is part of why they haven't addressed the 30 fps background characters.
Brazil: tunnel on the left side with some quality lighting
Waterfall: cave on the right side
Asian street: completed, left side and right side
London: bathroom(?) on the left side
Kanzuki: ballroom on the right side
India: elephant area on the right side
Military Base & Shadaloo stage: n/a, both look like they were last minute rush jobs though
NYC: ??? Maybe the bank on the right side? Not sure.
Ibuki will probably play pretty close to her 3S version and nothing like her bullcrap SF4 version.
I hope so. I actually didn't want to see Ibuki ever again after SF4, same goes for Elena and those 2 were my mains in 3s. The butchery was traumatic. But SFV is a lot less floaty and vortexy and trash than SF4, so I'm cautiously optimistic.