Full update info available on the Autodesk blog.
Additionally, a FREE SketchBook Copic Edition (subject to end license user agreement) is also available today, allowing everyone to get a taste of SketchBook Pro. The free application sports the Copic Marker brush set and a sample of 72 Copic colors. Available on the Mac App Store and www.copic.jp (Mac & Windows downloads).
Existing SketchBook Pro customers can get the update for free! Mac App Store customers can update directly.
All other customers can download the update from the SketchBook Update page.