The Columbia Journalism Review has the backstory:
When New York Times Magazine editor Gerald Marzorati, in the course of pondering the future of long-form journalism in a Q&A with readers, mentioned this week that the magazine was about to publish a 13,000-word story that cost an estimated $400,000 to produce, it was impossible not to wonder what the article would be about.
Readers more attuned to the calendar probably could have guessed: on the fourth anniversary of Hurricane Katrina, the piece, written by Sheri Fink and co-published by ProPublica, explores the deadly choices made in the storms wake at New Orleanss Memorial Medical Center.
You can read it here. I've only flipped through the story, but it's obvious you've got to be feeling strong to get through it.