Ballmer called the Office 2013 "a new generation of Office, where it is a service first." He continued that the new Office was designed with "the most modern devices in mind," though there was no mention of support for Android or iOS devices.
According to Ballmer, Office 2013 "takes the best advantage of Microsoft Windows 8, supporting touch, supporting inking, and the new Windows visual style, and ARM devices."
A customer preview is available at Office.com/preview.
With a focus on business collaboration, Office 2013 features support for private social network Yammer, and it comes with Skype integration, including 60 minutes a month of free Skype calling.
Office Home and Student 2013 RT will be included with Windows 8 devices, including the forthcoming Microsoft Surface tablets. The suite includes new versions of Word, Excel, PowerPoint, and OneNote.