I mentioned a while back that Dan and I were writing a Cesium-related chapter for GPU Pro 4. There is a short post on our chapter, A WebGL Globe Rendering Pipeline, on the GPU Pro 4 blog. Sounds like the book is on schedule to be released in March. Although I haven’t seen the table of contents, the initial call for authors said that the book would emphasize browser-based rendering techniques so there should be a lot of good stuff in it.