Android 4.4 KitKat, thoroughly reviewed
After three Jelly Bean releases in a row, Google has unleashed a major revision to the world's most widely used operating system. With the Nexus 5 comes Android 4.4 "KitKat." KitKat brings a ton of enhancements: support for hidden system and status bars, printer support, and lower memory usage. It also has a number of user-level improvements, including a new dialer, a Google-infused home screen, and a whole pile of UI refinements.