The InsideMicrosoft Blog published a news story on Windows Mobile 7

Microsoft is currently developing Windows Mobile 7, the first revolutionary change to its mobile device operating system. Recently, I was given a document by a source inside Microsoft that details the touch and gesture plans for Mobile 7. This document is a confidential internal use only document, used to explain the plans for Mobile 7, and contains well over a hundred pages of designs, ideas, and changes to the way we interact with our mobile devices.

Windows Mobile 7 To Focus On Touch and Motion Gestures