The Beyond Bubdle lists every digital game element thst is in all the combined books: the Bundle will have 8 Species, bit there are no Species in either hardcover and a single (Dhampir) in the Astarion.
Therefore, one of the only things we know ow about the final supplement in the bundle is...
Githyanki
Githzerai
Hadozee
Autognomes
Thri-kreen
Plasmid
Wildcard in Wildspace?
There are not Spelljamemr and Forgotten Realms product lines, there is only D&D, and Spelljammer is firmly im the DMG now alongside the FR. It really does fit the known information to a Tee.
While the DCs are basically DM fiat with a similar number spread to 5E, there are a couple pages of very specific example Skill tests to give someone the flavor of what they can do:
And there are some very specific examples of Expertises that get granted from aome Career Talents thwt can add...
Weirdly, I think the parallels between T1 Village of Hommlet and what happened with the final messy Temple of Elemental Evil book and how Phandelver got treated are extremely strong...
Yes, very much a "soft" system...but key to making this a Setting agnostic set of rules at heart. A character with the cultural expertise of Alethi wouldn't know how to drive a car or work a MacBook, but a Character with 21st century American cultural expertise can make the case they can apply...