The next version of Microsoft Office, Office 2016, is due out in the fall, but you can try it out now.
Microsoft has just made the Office 2016 Preview publicly available on the Windows desktop. New features include real-time co-authoring from the desktop app, like the current Office Online apps have, new application add-ins, additional data analysis tools in Excel, and more security controls for the IT department. You can find out more on the Office Blog.
If you want to try the preview, however, note that this will uninstall the version of Office you have already installed, so you should definitely know how to reinstall it once the preview period is over (when the final version Office 2016 is available). Here are the download links for Office 2016 Preview (32 bit) and (64 bit). And the preview product key: NKGG6-WBPCC-HXWMY-6DQGJ-CPQVG