Apple's iOS 27 update will prioritize cleaning up the operating system's internals, with engineers making changes that could result in better battery life, according to Bloomberg's Mark Gurman. The effort is said to be similar to what Apple did with its Snow Leopard Mac update years ago, and will involve removing old code, rewriting existing features, and subtly upgrading apps to improve their performance. The result should hopefully be a "snappier, more responsive" OS, says Gurman.