Mac: Microsoft released a preview build of Office for Mac 2016 a few months ago. Today, it's exiting the preview and being made available as a finished product.
The new version of Office brings it in line with Microsoft's newest interface improvements and OS X Yosemite. It also comes packed with a slew of improvements for working on documents as a group, integration with the iOS apps, and deeper support for OS X features such as gestures and full-screen views. Right now, it's only available if you have an Office 365 subscription ($12 per month). If you're a student, you can snag it for free if you're attending a qualifying school. Office for Mac 2016 will be available as a one-time purchase in September.