D&D General Barnes and Noble Preorder Page hints at November's D&D Book

[Henadic Theologian]

Its Darksun, we know its Darksun, the size and timing, the fact that nothing else has been hinted at in the UAs. I think Golly isn't a hint, just a code name.

 

[Whizbang Dustyboots]

The are a surprisingly low number of nouns that begin with “Y”. “Golly” might just be an expression of excitement.

Or the Y, if "GOLLY" is indeed an abbreviation (it probably isn't) is a proper name.

 

[Paul Farquhar]

Or the Y, if "GOLLY" is indeed an abbreviation (it probably isn't) is a proper name.

Unless it’s Yog—Sothoth, Y is an unusual initial letter for proper names too, and the double Ls as adjectives don’t help.

 

[Gorck]

General Observations of Legendary Lore of Yugoloths

 

[dave2008]

Maybe a typo for Gully - Dragonlance confirmed!