The past year has seen great strides in mobile development platforms with iOS 5, Android Jelly Bean, and Windows Phone 8. The new year promises more competitors with Firefox, Tizen, and Ubuntu all looking to enter the marketplace. Will any of the new platforms be able to attract enough users to be a major player, or are Apple and Google too established to lose much ground? Any new operating system will have to offer a compelling reason for users to buy devices and developers to create apps. Perhaps by the end of 2013 the picture will be clearer. In any case, this will surely be another exciting year for mobile app development.