A version of Office written for Windows RT will be included with Surface. Dubbed Office Home & Student 2013 RT Preview, it will include Excel, OneNote, PowerPoint and Word. Office 2013 for x86 computers will have a simplified and cleaner looking theme, but while Microsoft has said it will have some touchscreen features, the overall UI will still be more oriented toward keyboard and mouse interaction. So, presumably Office for Windows RT will also be optimized for traditional input devices. And we don’t know what the "preview" means.