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FairyLoot posted an aesthetic montage on their IG account on 4 October 2023 for the December 2023 YA pick…here is the book it is!
So far, What the River Knows will be in the FairyLoot December 2023 YA box, the OwlCrate November YA box, the GSFF October book, and will be a Barnes & Noble exclusive edition with "an alternate cover, unique case and case stamp, and designed endpapers," which you can find here. FairyLoot's edition will most likely not be signed because of the statement they issued on social media declaring they wouldn't be offering signed books in their boxes anymore.
Signed, personalized copies will be available at an indie book shop (Bookmarks) here. Please note, the last day to preorder these is 27 October according to the author here:
Obiligatory disclaimer: I am not sponsored or affiliated with any of these boxes, books, or authors. Additionally, a mention on my page does not mean I endorse the boxes, books, or authors. I am simply providing information.