So let's sue him and take this case to the Supreme Court.
I'm an artist, I work for a company where I paint murals. I'll be told, "Justin, you're gonna be in the location Monday."
Sunday night, I'm told "Justin, Monday's no good. Things got screwed up. We're pushing to next Wednesday."
What can I do? Yell and kick and scream at my boss? "Dammit, I made plans next Wednesday! And what about Monday? Now I have to find something to do! Argh!"
It's a part of life. Things happen. You can say something, like, say, in a keynote address. And then, well, something happens between then and, let's say, yesterday, that makes the dude who said that information in the keynote look like a liar.
But is it his fault?
For all we know, a shipment of white plastic missed the boat overseas and pushed back the production of a couple thousand iPhones a day or two, and so, while they're making them currently, they can't let you pre-order them yet, because technically they aren't ready, so better to be safe than sorry, but that doesn't mean they won't be here by the time the 24th rolls around.
I'm just saying... let's all go to bed, wake up refreshed, and see what happens in the next couple of days.