...but don't worry, just the art has been tinkered with. Brian Bolland was never happy with his work on The Killing Joke, and felt he let the side down by rushing it.
In this hardback, oversize, deluxe edition, he revisits the colour pallette and gives the story the look and feel he originally wanted. It works. This edition is really striking, artistically, and the book is a beautiful thing to read. It feels like a much more serious piece of work than the original, which used slightly cartoon-y colour tones.
There's nothing else to say - Moore's story is a classic. It is the origin story of Oracle, an alternate origin story for the Joker, and it gives an insight into his twisted relationship with Batman. It also highlights Gordon's strength, and his importance as a figure of reason.
If you own the original in another collection, and are unsure whether to buy this... do it. Bolland's work jumps out of the page at you, and feels completely different (in terms of colour pallette) to the original. Oh yeah, it also includes a bonus Batman story from Bolland, and the usual intro giving you the whys and hows behind it all. Enjoy.