I walk back my DL call. In light of a single reference and the legal dust up with the writing team of the new DL novels I don't believe they were creating a tie in product to take advantage of that. I doubt they would have messed with the publication schedule if they were trying to get both out around the same time.
I really doubt that Greyhawk is on this years schedule. So, who knows which setting is getting the tap. When they referenced 3 classic settings (first one down the new Ravensloft guide) I doubt they were talking about FR.
Spelljammer has been jammed into Planscape. I know for a fact we will not see that as a stand alone setting (that was from a conversation with with a member of the D&D team at a convention 2 years ago (which would be right at the time they would start a project that was being published this year).
I have my doubts about Planescape being published as a full setting. I can see a Sigil update with some info about the setting in general. The reality is, Planscape is the connective tissue for all the other worlds being part of the multiverse. It is just to large to tackle in a single product.
I just don't know.
You are technically correct. Dragonborn were not part of officially published OD&D to 3e because they didn't exist as a playable race. During 2e 1/2 Dragons existed (See Robert E. Moore's Greyhawk adaptation from Council Of Worms in Dargon Magazine). So a playable humanoid dragon PC was possible.
As of 4e Dragoborn, in the form of an NPC, were added to published Greyhawk with the 4e adaptation of Village of Hommlet (which was only available through Organized Play as a DM reward).
GoS was Greyhawk in all but name. WotC said it was a Saltmarsh book to avoid unlocking all of Greyhawk in the DMs guild. Technically you cold publish something dealing with The Sea Princes or The Kingdom of Keoland as they were in the book.
There were three refences to Dragonborn in the book.
- How NPCs would react to Teiflings and Dragonborn
- A Background that has a claim to fame of selling Dragonborn artifacts to some folks in the Shadowfell
- One of the choices of crew race for Neutral ships you might randomly generate.
So, in 5e they are there but how they are there story-wise is not really known.
So, if we get a Greyhawk setting book, expect that Dragonborn will be there.