The Microsoft spokeswoman didn't immediately explain how these new Office 365 bundles will fit in with, or possibly replace, the existing Office 365 editions available for the past year.

She also couldn't say with certainty whether Office 2013 and the new versions of Office 365 will have full feature parity across their applications, or whether there will be gaps and tradeoffs in functionality.

One thing Microsoft didn't address is the question of whether it plans to release versions of Office for iOS and Android devices, given the popularity in particular of iPads in homes and workplaces.

Asked to comment about this, the spokeswoman said that the new version of SharePoint will introduce native mobile applications across different device platforms, including Windows 8, Windows Phone and iOS.

"With the new SharePoint mobile apps, we are focused on delivering the capabilities to a broad set of people. We will continue to review all viable platforms based on our customer requirements," she said. Microsoft has a version of OneNote already available for iOS devices.