Microsoft Updates Office Apps for iPhone and iPad - Thurrott.com

iCloud Drive support for iOS Office is likely to be popular, and the new add-in model, based on HTML5, JavaScript, and JSON, makes it possible to create a single add-in that works on Win32, Office Online, iPad, and iPhone, with Mac OS, Android, and UWA (Universal Windows App) support to follow; check this Ignite presentation for more on the add-in model

"Microsoft recently updated the Office apps for iPhone and iPad, adding new features to each of the apps, Word, Excel and PowerPoint. Key among the changes: you can use iCloud Drive for documents and Excel for iPad now supports add-ons."

Microsoft Updates Office Apps for iPhone and iPad - Thurrott.com