I don’t think so. So far, WotC has never followup up on a book in their adventure anthologies. If the First World lore was meant to set up a new adventure, it would be in the summer adventure, not in one of these anthologies.
I think Spelljammer or Planescape make more sense for a planar...
So that means it’s likely either “Journeys Through the Radiant Citadel” or “Journeys Through the Radiant Ocean” and it’s an adventure anthology that is either set in/around Sigil, the Rock of Bral, or just setting agnostic adventures.
Citadel isn’t clearly on the image. Someone photoshopped different sections together and things it says Citadel, but even then the full word isn’t visible.
Wait… Crystals!
The title isn’t “Journey Through the Radiant Ocean” or “Citadel”
It’s “Journey Through the Radiant Crystals”
That’s why they used Crystals in the teaser, and the Ethereal plane mention. The concept is you’re “scrying” through these crystals to see these new adventures.
It should also be said that production schedules are fluid. Especially in 2022 when distribution could change things. It’s very possible something could get pushed or even cut in the editing room (like cameo appearances).
So yes, we likely get two settings this year, and ya maybe there’s a...
The new format is just “present a setting as part of an adventure anthology” most likely. If this is a Spelljammer Adventure Anthology Book, it covers all those bases.
And ya, if the title is “Journey Through the Radiant Ocean” then Radian Ocean is likely a reference to the Phlogiston, so this is probably a Spelljammer book.
The Market place depicted on the front makes me think Planescape over Spelljammer. But possibly.
We will get a Dragonlance book this year, but I doubt we get both an Adventure and Setting book for it. Same for Jammer honestly.