Beginning on February 9, 2016 and continuing for a couple of months, Microsoft will be pushing update notifications to people using Office ProPlus 2013 on Windows computers. (Office ProPlus specifically refers to the version of Office downloaded through your CMU Office365 account.) This will allow you to update to cheap Office 2016 and will be available to a small number of new people each day throughout the rollout period.
When the upgrade is available, you will se a yellow notification bar when you open any Microsoft Office application. This notification bar will allow you to accept or decline the upgrade. Please note that, while this update is optional, you will continue to see the notification bar each time you open Office even if you decline.
If you choose to update, please be patient, as it requires an 850MB installation file. This will download in the background and let you know when it's prepared. Once you're ready to install, simply follow the prompts to update to Office ProPlus 2016 and begin using the newest features available in Office.
For a complete list of enhancements in Office ProPlus 2016, please review this official page from Microsoft.