According to Blu-Ray.com, IT: Chapter 2 come out December 10th, but I'm skeptical of that date. There has been no official announcement confirming that date.
Bluray.com is usually spot on but sometimes they get the Vudu release date rather than the bd release date, so they're off by two weeks. Vudu doesn't have a release date on the site yet, they just say the film was released on the 6th of September.
As for the book, I returned it. It has a lot of great photos but I wanted more text and didn't get that and it wouldn't fit on my Pennywise shelf, the book isn't small, I expected it to be a bit bigger than a magazine but its a lot bigger. My fault for not reading the actual measurements.......