Looks like Microsoft is busy in polishing its inbuilt apps on Windows 10 Mobile. Early this morning,all office i.e. Excel, PowerPoint, Word along with Onenote are receiving updates. Looks like it is the weekly update to all office apps.
At the moment it is not clear what’s new. Changelog seems to be old. So, we expect is as bug fix and improvements.

Excel updated version: 17.6965.50462.0

Word updated version: 17.6965.47742.0

PowerPoint updated version: 17.6965.42642.0

OneNote updated version: 17.6965.57742.0

However, if you notice anything new, feel free to tip us !