Earlier today, Apple released iOS 7.1, fixing a few bugs in the firmware and adding some new features. Apart from the a few changes on the outside, iOS 7.1 adds support for two new iPad models; iPad3,6 and iPad 4,6.
These new models have yet to be announced, although these iPads look to be minor hardware updates, or support for certain international carriers. Apple usually changes the first number in the serial when releasing major iPad upgrades.
These new model finds are probably nothing to get excited about, if Apple does release these models, it will probably be a silent launch. With rather small upgrade or releases like this, Apple tend to keep quiet.