A new build is available for Office 2016 users that are in the Slow ring of the Insider Program. Despite today being the last day of the month, this one is called the January update, which isn't that surprising, since the December update was offered on January 11.
Once you install the build, you should be on version 1701 (Build 7766.2039). Here's what's new:
Collaborate on attachments in real time: Uploading email attachments to OneDrive lets everyone work on the latest version of the file. Use the drop-down menu on the attachment to either upload a revised version or save a new version. For more information, see Attach a file to an email in Outlook for Windows.
Use your pen to manipulate objects: In Word, grab object handles with the Surface pen to resize, rotate, move, and more. Find out how.
Visio add-in for Database Modeling: Now available for download, the Visio Add-In for Database Modeling add-in helps while planning the creation of a new database or understanding an existing one. Download the add-in now or learn to reverse engineer an existing database into a database model.
New education templates and diagrams: Students and teachers can use new templates and sample diagrams that cover many subjects, including algebra, chemistry, physics, and more.
As you can see, most of the new features don't exactly appeal to mass audiences. Not everyone has a PC that supports pen input, and it's a small subset of Office users that do any kind of database modeling. Still, it's always good to see more advanced features being added.
To sign up for Office Insider, open any Office app and go to File -> Account -> Office Insider. If that sounds a little fast-paced for you, don't worry, as this update will likely roll out to Production within a couple weeks.