The Sky: The Art of Final Fantasy Boxed Set

[Raven]

^ as per description on Amazon, slipcase and just books.

The elegant slipcase containing The Sky I, II, and III features the same wraparound exterior artwork as The Sky Boxed Set, with a double-hinged flap that folds around the open edge and is held flat to the back side with a hidden magnetic closure, making it easy both to remove the books and to display the set closed. Don't miss your chance to return to the strange and beautiful realms of Yoshitaka Amano with The Sky: The Art of Final Fantasy Slipcased Edition!

Oh and according to Dark Horse this is not limited this time round.