The team at Apple is working on a new design for iOS 7, which will likely make its debut on the iPhone 5S, but apparently the entire project is running behind schedule.

"What I've heard: iOS 7 is running behind, and engineers have been pulled from OS X 10.9 to work on it," Apple insider and frequent commenter John Gruber said in a chat post recently. Apple's design chief Jonathan Ive is working on iOS 7 and, according to recent reports, is trying to make the design "flatter" and easier to use than ever before.

"Regarding Jony Ive and iOS: Word on the street is that iOS engineers with carry privileges all have some sort of polarizing filter on their iPhone displays, such that it greatly decreases viewing angles, thus making it difficult for observers to see the apparently rather significant system-wide UI overhaul," Gruber added.

Another Apple commentator, the editor in chief of iMore, added his own insight. "Ive's work is apparently making many people really happy, but will also apparently make rich-texture-loving designers sad," Rene Ritchie said.

It's unclear how far behind iOS 7 is, but Apple typically unveils its latest mobile operating system during its annual World Wide Developer Conference (WWDC), which typically takes place in June.