(1) It's not pure CSS3, there's JS involved to handle events. Sure it's small, but it's not.

(2) The only real gripe is that the animation is not accurate to an actual iPhone. After the unlock there is a delay between the lock/title moving away and the icons moving in. Both items clear the screen before the other items enter. Also there's a fade on the lock screen items.

Demos like these are cool if they are well done, and correct. Otherwise they feel more like a gimmick. Having written webkit animations, all the added effect (the fades and timings) could be done with CSS3. So if you're gonna do it, do it well.

Now after the criticism, good job. I like that all the icons and font and screens are all HTML/CSS objects.