Doesn't mean that the various Planar Lords won't be in there.
I'm guessing it'll include the gods in the MM and PHB -- basically the list in the back of Defenders of the Faith. And, if they stay true to that, there will be a mention of many of the demon lords and devil princes.
In fact, if we stay with the idea they'll be doing the gods in Defenders of the Faith for the DDG (and that would be a safe guess, IMHO,) we've got:
Blibdoolpoolp: Kuo-toa goddess that hates surface-dwellers
Callarduran Smoothhands: Svirfneblin god that protects the deep gnomes.
Deep Sashelas: Sea elf warrior-god.
Diirinka: Derro god of magic
Eadro: Merfolk/Locathah watchful god.
Great Mother: Infamous beholder goddess.
Gruumsh: Orc-God-Dude
Hruggek: Bugbear sneaky-war god.
Kaelthiere: Evil fire goddess of salamander, efreet, and azer.
Kurtulmak: Kobold god guy
Laduguer: evil Duergar taskmaster
Laogzed: Troglodyte consuming-souls god.
Lolth: Creepy dominatrix drow chick.
Maglubiyet: Goblin/Hobgob god.
Merrshaulk: Yuan-ti poison snake guy
Panzuriel: Deep Aquatic Evil, friend of merrow, sahuagin, scrags, and kraken.
Sekolah: Sahuagin patron of sharkiness.
Semuanya: Lizardfolk survival god.
Shekinester: Tripple-aspected naga goddess
Sixin: Dual-aspected Xill god.
Skerrit: Sylvan centaur god.
Aasterinian (Dragon): Io's messenger, dragon-trixster, brass goddess
Bahamut (Dragon): Big arse LG dragon-god.
Chronepsis (Dragon): God of draconic death and lore.
Falazure (Dragon): Evil, undead death dragon dude
Io (Dragon): The Ninefold supreme dragon god.
Tiamat (Dragon): Nasty LE evil-dragon-goddess
Annam (Giant): Giant creator-god
Grolantor (Giant): CE hill giant god of dumb brutes
Hiatea (Giant): Nature-chick-goddess
Iallanis (Giant): Goddess of larger-than-man-sized gettin' it on.
Memnor (Giant): Evil god of trickery and rebellion
Skoraeus Stonebones (Giant): Stone giant god of rocks
Stronmaus (Giant): Storm-giant god of boisterous joy
Surtr (Giant): Fire giant-god of flamin' godliness.
Thrym (Giant): Frost giant-god of frosty magik.
Vaprak (Giant): Ogre god of frenzy & greed
Planar Lords (No Description Given):
Demon Princes: Yeenoghu, Alvarez, Alzrius, Baphomet, Demogorgon, Eldanoth, Fraz-Urb'luu, Graz'zt, Juiblex, Kostchtchie, Lissa'aera, Lupercio, Lynkhab, Verin, Vucarik.
Archdevils: Baalzebul, Bel, Belial, Dispater, Fierana, Glasya, Levistus, Lamagard, Mammon, Martinet, Mephistopheles.
Elemental Lords: Ben-Hadar, Chan, Imix, Ogremosh, Olydra, Sunnis, Yan-C-Bin, Zaaman Rul.
Then it mentions that there are "mighty celestials," "sladd lords," and something about formians, but doesn't detail any of them (likely a lack of space).
Hmmm....with such a great number, I wouldn't be surprised if we just saw a web enhancement with most of these a-la the FRCS supplement with all the "unpopular" deities.
Or they could probably weasel a second book out of it. Call it maybe "The Tome of Ascendants."

If they don't do it, I might end up doing it.
