Microsoft rolled out a preview version of Office 2016 in March, but that was restricted to IT pros and developers and required registration. Now the beta version of the office suite is available more broadly.
Subscription Office 365 customers can make an effective immediate switch to the 2016 version. If you're not an Office 365 customer, you can sign up for a time-limited trial version. As usual with previews and betas, caution is advised -- this isn't necessarily the suite you want on your everyday work machine. Hit the link below for detailed instructions.