Very nice from a historical sense.
Though much of this has already been answered by Lauren Faust, the development process is well mapped out in detail. The fact Lauren was going to make Celestia a queen for example.
One can see where Lauren placed a lot of emphasis on some characters like Pinkie Pie and Rainbow Dash. However, the show runners elected to ignore some of the more negotiable details like the size of the cities and population distribution.
The layout and official release of the sketches we've seen leaked before makes this bible so much more awesome.
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