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Thinking of getting that myself. Let us know if it's any good ^^
I'm guessing it'll be a more comic-oriented 'Art of Equestria' kind of thing, but I could be wrong - not looked at it yet. Really, I only bought it for the Andy Price cover - I love his artwork.
That's exactly the reason I'm interested in it :p no one draws Luna as well as Price! Fave pony artist bar none.
Buy it, then - his section has the 'caffeinated Luna' picture, which makes it worth the cover price on its own.