Office editing on the iPad Pro won’t be free unlike on other iOS devices
Let’s preface this story by saying that this should not be a surprise. Mind you, the base functionality of every Microsoft Office app is available on most iOS devices for free. Advanced features do require that Office 365 subscription, but if you found yourself getting by or getting away with what you could do on Word with an iPhone, it will still be the case for you.
That’s not going to be the case if you get any with the iPad Pro. You’ll need a 365 subscription to do any editing in Office on the 12.9-inch tablet. Microsoft has historically made clear in the End User License Agreement for Android devices and in app descriptions on the Play and Windows Metro Stores of a clear functionality cut-off point based off of how large your screen is. The magic number in specificity? 10.1 inches.
Note that there’s no language on anything in the EULA for iOS nor on any of the Office app descriptions in the App Store. We may see that language made soon.