Besides the much-awaited launch of the Windows 10 on July 29, Microsoft is currently working on with the next release of its productivity suite – the Office 2016. The Office 2016 Preview is now available for testing. Just head over to this link to download (with product key).
Some of the key features in Office 2016 Preview include the Real Time Presence in Word (which plays a huge part in real-time collaboration), simplified file sharing, insights for Office (currently in Word and Outlook), version history improvements, Power Pivot improvements, improved grammar checkers, and more. More info here.
Office 2016 Preview comes with Office Automatic Updates, meaning that whenever there is a new update, the program will be automatically updated. Moreover, the preview trial will continue to work until Office 2016 is released (or 149 days from today, which is November 2, 2015).