I think we may be going to the new world partially, but I don’t think the golden WoL in the Endwalker pose is a reference to that. It is more than likely referring to the decade anniversary.
That was my initial thought as well, especially given the fact that they are indeed poses from previous expansions (the one on the left pillar is from ARR, I believe?). There's also the fact that there's a lot of gold lettering in their Anniversary site.
But then I made the connection to the New World's cities of gold, and then made another connection to the Gilded Araya fight they've previously announced (which is the biggest hint by far, now that we know 6.5 trial is probably Zeromus, not Asura). I don't know, the gold poses could be from a moment in the trailer like the Shadowbringers trailer where they're calling back to the previous expansions with various jobs.
I could be wrong but eh, speculation is part of the fun at this part of the expansion lifecycle.
Speaking of speculation, anyone have any last-minute guesses on the new job(s)?
A lot of people are hoping for Beastmaster, including Sakaguchi himself!