Besides supporting all iOS 7 devices, iOS 7.1 brings support for a pair of new iPad models: iPad 4,3 (download link) and iPad 4,6 (download link). These models have not been announced by Apple, but they likely represent minor hardware revisions…

From time-to-time, Apple silently updates its devices with either improved or more efficient components. These rarely are announced or have any effect on customers. It is also possible that these devices could be devices optimized for overseas networks (China?). For context, the existing iPad 4,1 and 4,2 are iPad Air models and recent iPad mini with Retina display models are labeled as 4,4 and 4,5.