Was there a Minecraft tie-in book?
I assume all their comments in the document about how to repurpose these Eldraine creatures for a Feywild or Giants campaign are their tie-ins.
For the planeshift comments -- it should be noted that each Magic setting that got a big coffee-table book and a planeshift article has a rough equivalent in D&D -- Zendikar to D&D in general, Innistrad to Ravenloft/Shadowfell, Kaladesh to Eberron, Amonkhet to Dark Sun, Ixalan to Chult (even was launched around same time as Tomb of Annihilation season), Dominaria to the core kitchensink worlds. Even Ravnica can be repurposed for Sigil (SIH-GHILL not SIH-JILL). Theros and Strixhaven don't have rough equivalents, but are both themed around extremely common D&D fantasy concepts (tons of campaigns use the Greek Gods or draw from Magical School stories).
So doing Eldraine, the rough equivalent of the Feywild, is not unsurprising. What's surprising to me most is that we didn't get it in 2019 or 2020. But glad it's finally happening here, and we don't REALLY need a setting book when there's so much MtG lore published on the Magic side of the website. It would be nice if they repackaged that as a Gazetteer though, a la Baldur's Gate just recently.