Blizzard CEO Paul Sams has delivered in that regard. Speaking with Gamesindustry.biz (a free account is required to read the whole article) Sams went on to make a bevy of remarks that reinforce the developer's stance of, "It's done when it's done." while also commenting on the "devastating" effects of shipping an unfinished product.
So what gets devastated? The people who put in all those long hours of hard work, says Sams. We believe it, too. This kind of issue is bad for any game, but for an MMO we can only begin to imagine the sort of downtrodden emotions that can permeate a dev team after seeing their work pushed out into the world before it's ready. And while we all know MMOs are living, breathing things that are never "Finished." there's still a point where more gestation time is far better than getting pushed out the door prematurely.