An interesting side effect caused by the degree of visual change in iOS 7 is the amount of refinement that is still in progress in the betas. It gives us all the opportunity to watch as substantial changes are still being made to the OS – much more interesting than the more minor alterations and bugfixes you usually see in pre-release betas. Animations and UIs are still being worked out, changed, tweaked and polished.
You very rarely get the chance to take a sneak peak at other teams development processes – the current iOS 7 betas offer a great opportunity to do so. So install the betas, strap in and watch a new OS emerge.