And with two weeks until Apple’s June 10 keynote at WWDC 2013, we’ll soon find out just how deep the rabbit hole of visual changes in iOS 7 go. For now, we’re asking you to join the discussion and tell us where you stand on the black & white iOS 7 revamp…
Gurman wrote in his exhaustive iOS 7 revamp story:
While the core elements of those apps are mostly white, each app has been given a unique button color.
Essentially, each app has a white base with a respective color theme.
And here's another screenshot shows how the dialing box will looks like: