D&D 5E The October D&D Book is Fizban’s Treasury of Dragons

As revealed by Nerd Immersion by deciphering computer code from D&D Beyond!

Spoiler

Fizban the Fabulous is, of course, the accident-prone, befuddled alter-ego of Dragonlance’s god of good dragons, Paladine, the platinum dragon (Dragonlance’s version of Bahamut).

Which makes my guess earlier this year spot on!

UPDATE -- the book now has a description!

D&D 5E - Fizban's Treasury: The Dragon Book Now Has A Description... And A Feat

Courtesy of Amazon, we now have a description for Fizban's Treasury of Dragons, the October D&D hardcover. The book introduces gem dragons, dragon-themed player options, and plenty of draconic lore! This joins September's The Wild Beyond the Witchlight, and November's Strixhaven: Curriculum of...

www.enworld.org

D&D 5E - My guess for the other D&D book this year... Draconomicon!

We know the fifth major product this year will be James Wyatt‘s as-yet unannounced project, and we know it will be coming out this year between Witchlight and Strixhaven. Wyatt co-wrote the Draconomicon for 3E. There have been two recent dragon-themed Unearthed Arcanas — dragon-themed...

www.enworld.org

Fizban the Fabulous by Vera Gentinetta

 

[Levistus's_Leviathan]

Hollowed like Celestial Dragon?

Hallowed would be Celestial. Hollowed would be like Soulless undead dragons that were animated by some type of spirit (historically it was elemental spirits).

I think Elder Brain Dragon will be a Template with a size requirement (the Dragon has to be big enough to carry an Elder Brain on its back.

On its back? I always pictured an Elder Brain dragon as having its brain replaced by an Elder Brain, like how Intellect Devourers can replace the brains of Humanoids.