We've heard it has been in the pipeline for a while, but now thanks to The Verge we are getting some concrete evidence that a version of Office 2013 is coming to both iOS and Android in 2013. Citing several unnamed sources, Office Mobile will be coming to iOS - presumably for both the iPhone and iPad at the same time - in February or March 2013, with an Android version to follow in May.
The apps for Office Mobile will all be free, and will easily allow the viewing of Word, PowerPoint and Excel documents on the fly, so long as you have logged in using your Microsoft Account. If you want to add editing to the apps, you will need to purchase an Office 365 subscription, which is of course different to the fully free offering available on the Surface and other Windows RT devices, as well as Windows Phone.
A few screenshots were leaked as well for Office Mobile, with all three versions (iPhone, Android and iPad) seemingly previewed, albeit with barely any details other than features we assumed would be included. Look out for an official announcement of Office Mobile soon, as Microsoft gears up for the full launch of Office 2013 early next year.
Source: The Verge