Samsung released a new version of its S Pen SDK to make it compatible with new functions of the Galaxy Note II. In that sense, developers will be able to make apps that interact with the S Pen even when a user hovers the S Pen over the screen — so called Air View feature.
In addition, app makers can also take advantage of the feature that allows launching of pre-defined apps when the S Pen or Earphone is plugged or unplugged and add new capabilities to their creative apps.
If you’re into making apps for the Galaxy Note devices (including the 10.1-inch model), you’ll want to download the new SDK. It’s available from here.