1. I haven't been able to read the whole book yet (it's busy season at work and I'm prepping Curse of Strahd for another group), but what I've seen of it looks good.Does the content measure up to the art quality? Did the PDF add-ons all get created? Will they be made available to the public, maybe in a single physical collection? Have they indeed started the Humblewood 2 alpha yet?
2. Yes!
3. It looks like physical versions of all the PDF add-ons are included in the box set.

Humblewood Box Set
Humblewood is a campaign setting for 5e that includes 10 new player races, new monsters, compelling adventure and more! The Humblewood Box Set contains the hardcover book, reference deck, maps and standees. Everything you need to get right into a woodland adventure. IMPORTANT UPDATE: As part...

4. If they have, I don't think I got a message about it. But I could have missed something (see answer #1).
You didn't ask about the minis, but I got some of those too, and they're lovely.
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