In our April webinar "SharePoint 2013: Building Better Business Outcomes," Kelly Rusk and I covered the mobile capabilities and limitations of SharePoint 2013. Recently Amanda Lefebvre on the Office 365 blog announced upcoming changes that address some of the limitations around mobile access and real-time coauthoring.

To recap, web content generally "just works." Default mobile views are rendered with larger clickable areas to optimize for touch screens on mobile devices. For Office documents, Office Web Apps is used to render in-browser desktop and mobile views for Word, Excel, PowerPoint, and OneNote. According to the Office Web Apps Server Overview, the support for tablet/slate editing of Office Web Apps documents is limited to Windows and iOS (see image below).

With the recent IDC report that Android tablets now have the largest market share, taking nearly all of it from iOS, this is a major limitation for providing mobile access to SharePoint content. So it comes as no surprise that Microsoft announced plans to support Android devices. Amanda Lefebvre blogged that Office Web Apps support for Android devices is coming soon:

The full power of the Office Web Apps is already available for Windows 8 tablets and iPads and we will be extending the same capabilities to Android tablets via mobile Chrome browser support.

There are also other announcements around improving the user experience and introducing real-time co-authoring of documents. Real-time co-authoring is actually available in SharePoint Web Apps now - just try it out from your SkyDrive or SharePoint Online.