As promised, the Mass Effect 3 "Extended Cut" downloadable content is available today. It's available for the Xbox 360 and will be coming to PC soon, but the PlayStation 3 version isn't coming until July 4. Spoilers follow.
The Extended Cut adds more context to the endings, but doesn't change the key choice that bothered some fans. BioWare pointed out that people who rejected the concept itself won't be pleased. But fans looking for some more clarity and detail should like it a bit better. Plus, some fans have already noticed a fourth option, in which Shepard simply refuses to make any choice at all.