https://www.macrumors.com/2013/05/01/apple-engineers-working-overtime-on-ios-7s-deforstallization/
From the above post:
I think this is/was true. No iPad preview yet, multiple things look rushed to me in iOS, no real AppleTV interface changes, OSX Maverics looks like it stalled to me on design too (Calendar Icon etc). I have a feeling they are still playing catchup.
From the above post:
According to a report from Bloomberg earlier today, Apple has been forced to delay its internal timelines for iOS 7, but the companys engineers are said to be working overtime to get a preview ready for the upcoming Worldwide Developers Conference in June. Multiple sources have indicated that Apple is pulling engineers from OS X 10.9 to help the company stay on schedule with iOS 7.
I think this is/was true. No iPad preview yet, multiple things look rushed to me in iOS, no real AppleTV interface changes, OSX Maverics looks like it stalled to me on design too (Calendar Icon etc). I have a feeling they are still playing catchup.