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Can confirm it's in LCS! Glanced through it - it has the variant for #1 by Cully Hamner and the unused cover by Phil Noto as back matter. It runs in order from #1-#12, and includes each main cover between the stories. It also puts an additional blown up piece of art on the back side of each cover.
No new introductions, interviews, extras, sketches, or anything, though. It seems to be decent, if not quite as high quality in terms of paper and cover, as the three Cass Batgirl books - I held it up next to those, and they would indeed look very nice next to each other.