For now, the feature is available only to One Drive for Business subscribers, but it will be available more broadly soon, Microsoft says. A new Share option on the Office application’s ribbon will help you share files and make them available to others to review, comment, and edit more easily than in the past. Currently available only in Word and Outlook 2016, Insights for Office is a Bing-powered experience that provides contextual information from the web right in the reading experience. Koenigsbauer says that the update includes many other new features, including Power Pivot improvements, improved grammar checkers, and more. To get the Office 2016 Preview for Windows, visit the Office web site and sign up for the trial.

If you have a Microsoft Office 365 subscription, you can upgrade to Office 2016 for free either from within your Office program or through Microsoft's website.
If you have an Office 365 subscription, are currently running Office 2013, and have automatic Windows and Microsoft software updates enabled, you might get an upgrade notification from within Office to upgrade to 2016.
When we started the preview, we noted we would be adding features regularly for customers to test and just this month released several new updates.” Mr.
Koenigsbauer doesn’t provide a complete list of improvements in the latest update, but he does note the following highlights: Real Time Presence.
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This chart from the Office 365 community shows the upgrade timeline based on Office 365 plans or versions (the table is blank for Office 365 Home, Personal, or University but you can upgrade to Office 2016 now with those plans): If you don't want to wait for the upgrade notification, you can manually install or upgrade to Office 2016 by going to the Office website and signing into your Microsoft account. Sign into your Microsoft account from the My Account page. Click on Install and then Install again on the next screen.
This will prompt you to download the setup EXE file to your computer. Click on the setup file to run it and the installer will upgrade your version of Office to Office 2016.
What are the system requirements for Office Professional Plus 2016 for Windows?