First look: OneNote 2013 | Ars Technica

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"In response [to the market shift to non-stylus touch interfaces], Microsoft has made not one, but two new versions of OneNote. There's a regular desktop application that's a derivative of the current OneNote 2010 product and will run on both Windows 7 and Windows 8. There's also going to be a new, Metro-style OneNote application built for finger friendliness.
OneNote is one of only two applications in the Office 2013 suite getting this treatment (the other is the Lync client); all the other Office 2013 applications are straightforward desktop apps. We've had a chance to use the desktop application for a few days, and we'll look at the Metro-style application once it becomes available."

First look: OneNote 2013 | Ars Technica