Book of Sith and The Jedi Path are published from the same company that did Stellar Cartography and the Federation: The First 150 Years.
As For the Essential Guides, those are Del Ray/LucasBooks, and we already know what Pocket Books stance is on coffee table books, so I don't expect to see anything like the Essential Guides for Star Trek any time soon. Maybe 47 North or even DK will explore something like them in the future, but I doubt we will get anything like them in the near future. They would be nice to get though, I agree.
I'll be getting this soon finally. I saw a couple of reviews/unboxing videos on Youtube for the book and maps and was extremely impressed.
It would be neat if we could get a picture online for every book so we could know how the main characters look. Like they did it with the last Leia novel.