iOS 5.1 is rumored to launch around the same time as the iPad 3, with an abundance of new features. The new features include Japanese language support for Siri, a new camera slide button on the home screen, and the possibility of Siri support on the iPad 3. iOS 5.1 has been in beta for quite awhile, but hasn't hinted at any of these features.
iPhone Hellas has reportedly obtained a screenshot of a new robust note taking app that will be launched on iOS 5.1.