How soon is the new Clone Wars book coming out? Do we know?

Unknown. There is a discussion about it here

We won't have an idea of exact time frame until the book's status moves to "shipping now," which means it'll be about two weeks from then that the book will be available to purchase.

That said, FFG did post a new preview article yesterday, so hopefully that means the book's closer to being released. I'd love a November release date, but unless it updates to "shipping now" either today or tomorrow, I'm thinking December or even January is more likely.