Microsoft today released new builds of its Office for iOS apps for Insiders on the Fast ring, bringing the version numbers to 1.31.1 (170326).
In Word, you'll find touch controls that allow you to select and resize rows and columns in a table. You'll also be able to insert endnotes into documents.
Co-authoring is a major improvement in Excel. You can now see "who’s working with you in a spreadsheet, see where they’re working, and view changes automatically in seconds." Microsoft says that the feature is now available in Excel for iOS, Android, Windows 10, and the web, with Mac support coming soon.
Finally, PowerPoint for iOS gets Designer, as long as you have an Office 365 subscription. You can get started by inserting an image and testing out various design suggestions that the app provides.
Microsoft announced the Office Insider Program for iOS back in August, and unfortunately, it requires an invitation which you can apply for. The application will ask what your most used Office app is on your iOS device, and make sure you're honest, because that's likely to be the only one that you get approved for.
