"Unlike some previous editions of Apple's mobile operating system, iOS 5 and iOS 5.1 haven't seen a string of incremental updates, in which bugs are fixed and small features added."
"Evidence has surfaced pointing toward the introduction of a quad-core processor in future Apple iPhones and iPads. The current processor of choice for the 4S and iPad 2 is the dual-core A5, but keen observers over at 9to5Mac have spotted updated code inside the latest beta version of iOS 5.1 that offers support for quad-core processing."