In a Branch chat, which at the time of this writing is still going on, Daring Fireball's Jon Gruber says that, according to what he's heard, iOS 7 is running behind schedule and that it will bring a significant user interface (UI) refresh. What I've heard: iOS 7 is running behind, and engineers have been pulled from OS X 10.9 to work on it. (Let me know if you've heard this song before.)Gruber went on to say that he's heard that iOS 7 is a "significant system-wide UI overhaul" and that iOS engineers that are allowed to carry around devices with iOS 7 on them have a special privacy filter on their devices that reduces viewing angles. Back in 2007, Apple delayed the release of OS X Leopard to concentrate work on iPhone. Gruber hints that this could be
