Yes, it is new, I was just creating a thread for it myself.
This book, by the way, is coming out less than a year from the final core book being released.
I can certainly see an Eberron one focused around the Five Nations or a Greyhawk one around the Free City and environs, or even a Guide to Sigil in the same vein. Not sure about Ravenloft (its too diverse to just focus on one region, unless you did Darkon/Necropolis but then you don't get Strahd as a draw.) or the other settings.
In my best fever dream though, a 5e Kingdom of Karameikos would come out. I'm not holding my breath.
Not sure the Purple Dragon Knights would be frequently found in Waterdeep, but they would be seen around the Heartlands, which is the southern part of the Sword Coast, (Berdusk, Ireabor, Elturel, even Baldur's Gate).I'm not an expert in the Realms, but I assume Waterdeep is a city where folks from various parts of the Realms frequently visit. Maybe characters like Purple Dragon Knights are in this new book because they travel in and out of Waterdeep, and not because they're actually native to the Sword Coast itself. This would enable the book to feature all kinds of characters from different places.
Good move. They've talked about being reluctant to release massive setting books, and I get their reasoning: it's a massive investment for them, new players will be overwhelmed and there's not enough space to go into much detail about anything. I'm totally with them - I'd much rather a detailed look at a small section of a world that's actually of some use than a massive tome I'll never read. I'm not massively interested in FR, but I'm running some of the published adventures. And the cities of the Sword Coast do appeal to me a little, if only because they have such great names. Greenwood was on fire when he named Baldur's Gate, Waterdeep and Neverwinter!
tldr: whatever the logic behind WotC's release schedule, it's working for me.
Then people in those other threads never played AD&D 1e.
Other threads have conclusively established that this is the most sparse D&D launch. By far.
Why not? Once the OGL is announced/released I bet you that a slew of campaign guides will come out, its inevitable. Primeval Thule is going on right now and its for 5e.
I'm not an expert in the Realms, but I assume Waterdeep is a city where folks from various parts of the Realms frequently visit. Maybe characters like Purple Dragon Knights are in this new book because they travel in and out of Waterdeep, and not because they're actually native to the Sword Coast itself. This would enable the book to feature all kinds of characters from different places.