This is the most confusing thing to me. I feel like there is usually a short delay (like, a week or two) and these former iWork apps are updated in a sort of second wave.
But this time, various app updates which typically seem to turn up on a much more irregular basis – like Apple Support, TestFlight, and just yesterday Apple Store – have all been updated already… but Pages, Numbers and Keynote are still hanging out in the dock/Home Screen with bright colour & white app icons, and presenting non-Liquid Glass adapted interfaces in use.
The only way it makes sense to me is if Apple have decided to significantly re-work the UI for these apps, and intend to pair the release of the new versions with an education-focussed new gen. MacBook…