Microsoft is looking to release Office 2016 next month bringing the version to the same version of Office for the Mac. A leaked screenshot was released at Ars Techinca. So far it looks like it is not much of a feature upgrade, but mostly an aesthetic update. The biggest change is the title bar being the bright flat color of the icon. This is similar to the Windows store versions of the Office suite, but with all the functionality.
I’m not sure if this is what everyone had it mind when it MS promised that the new constant update cycle. I think more substantial feature changes on a quarterly-like cycle were more what we expected. I’ve always been skeptical that they would ever be a quick release cycle with major features.
ArsTechnica link: Office 2016 for Windows