Mac users will want to download the latest Office update right away, because it includes the usual security updates (no small thing), as well as a few useful new features to the suite of applications. OneNote users now have new spell-check features that were missing before for some reason.
Office 365 subscribers also get some new features. In PowerPoint, you can now use a tool that lets you snip away as much as you want from the beginning and end of audio and video files. In Excel, you can now use CONCAT or TEXTJOIN to shorten text formulas. So download the updates and take them for a spin.