Since it's on-topic for this thread as well, I thought I'd share a
post from another thread I made looking at some of the comparisons. For reference, the release version is on the left, the original reveal footage is on the right in each pair.
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I wanted to take a look at some of these comparisons.
In addition to much sharper detail, we see more geometry in the scenery, more detailed trackside textures, better lighting and a more pronounced dynamic range. Here's another simple one:
The amount of both geometry and texture detail in the release version is dramatically improved. I prefer the warmer lighting and the dynamic range we see, though those are stylistic changes.
This one's a dramatic upgrade, with more detail on basically everything in the scene with regard to textures, geometry, lighting and the addition of meaningful amounts of new track-side detail. Look at the trolley lines overhead.
I see changes, but I don't understand the claims that these are flat-out downgrades in any way.
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For the sake of ease: