They already made Shemeska one of the narrators to Mordenkein's Tome of Foes. Such a "Guide to the Planes" would likely be a Planescape Setting book, full stop, which is to my mind currently the most likely possibility.I'd be unsurprised to see WotC split the difference, actually and have "X's guide to the Planes", with a sort of Xanathar-style personality guiding us through the Planes. Just so long as it's not some GOOGLY-MOOGLY has-been Forgotten Realms "celeb" like Volo. He can go back into retirement. Bring us a REAL NPC from Planescape. Someone who says "berk" non-ironically.
(Note: portions of this post may not be intended seriously - adding this before someone decides to defend Volo's "honour" or something equally mad!)
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