These screencaps were posted by GM Leigh (of Mage Productions) on Twitter after being showed on WotC's Twitch stream, presented by Kate Welch and Nathan Stewart. Note the old Saltmarsh trilogy references!
Ravnica was primarily done by the MtG team and was a bonus book. How much it “counts” is debatable. If it counts, the Ravnica art book can as well.
Honestly, it's almost guaranteed that this will be set in FR. I mean, 5 years in, EVERY major AP has been set in FR (barring Ravenloft) and why on Earth would they support a setting that has been out of print since before the vast majority of D&D gamers were born?.
If they republish the Saltmarsh modules as a 5e conversion, and they feel the need to remove the adventure from Saltmarsh (which is on Oerth, the World of Greyhawk) and transplant it to the Forgotten Realms, I might have to put some effort into organizing the Greyhawk fans into some kind of actual pain in the ass until WotC quits dumping on the setting, by which I mean pillaging Greyhawk's stories and characters while continuing to forbid 3rd party Greyhawk products and 5e Greyhawk updates from being put up on the DMs Guild.
It's already gotten ridiculous, it rapidly approaching the point where my inherent laziness will be overcome.
IF it is not set in Forgotten Realms AND IF includes some setting material (also mini-setting would be sufficient) AND IF that setting material will be open for DMsGuild authors to develop, THEN I could consider buying this book.
A few thoughts:
* U1-3 is level 1-5 if they keep the original level range. This corresponds to statistically the most popular range for adventures and the range of the waterdeap book.
* U1-3 is a bit short to fill a book on it's own. The remaining space could be taken up by ship and underwater rules and creatures, or the adventure could be expanded up to level 10.
* It has ships and underwater, but I don't remember any navel battles (as featured in UA) in U1-3.
* Saltmarsh was originally located in Greyhawk but it could easily be relocated to any generic fantasy setting (or even real world 17th century Cornwall).
Considering that per Mearls, they just started revising the vehicle rules based on feedback, and this book is in layout, I doubt the seafaring UA was meant for this release. It was probably meant to be useful for playtesting with this book.
A few thoughts:
* U1-3 is level 1-5 if they keep the original level range. This corresponds to statistically the most popular range for adventures and the range of the waterdeap book.
* U1-3 is a bit short to fill a book on it's own. The remaining space could be taken up by ship and underwater rules and creatures, or the adventure could be expanded up to level 10.
* It has ships and underwater, but I don't remember any navel battles (as featured in UA) in U1-3.
* Saltmarsh was originally located in Greyhawk but it could easily be relocated to any generic fantasy setting (or even real world 17th century Cornwall).