The WBC is a collection of previous published articles. They have been cleaned up, organized, and formatted for publishing in a pdf format, but they don't contain any new information from the original articles. It's a mix of articles that talk about word building in general, and articles that focuses more on the CC3+ side of things.

There's also some additional tutorials bundled with it which I haven't been able to look over, but I believe those are sourced from the annuals.

Make sure to talk to @Ralf , I am sure he would love to have this as an article on the official blog, he's always looking for good material. I think this will fit neatly.

No, inlays.

Dragons are also very nice for fantasy locations. Would fit perfectly in my campaign.

Celestial patterns are always good. Some moon/sun/stars stuff.