There are following new features available in SharePoint Server 2016
1- Access Features : The following new Access features are available when you deploy Access Services in SharePoint 2016:
1.1- Support apps for Office
1.2- Download in Excel feature available for users to pivot Access tables.
1.3- The Cascading Combo box is now available in Access.
Compliance features : The following features are now available for working in SharePoint Server 2016 document libraries:
• Landmarks to a page make it easier to navigate, and there are alt text improvements for all major navigation links.
• Keyboard short-cuts are provided for the following document tasks:
Alt + N - New
Alt + E - Edit
Alt + U - Upload
Alt + M - Manage
Alt + S - Share
Alt + Y - Synchronization
• Focus improvements, such as keeping focus on prior elements and focus trapping.
• Announcements for upload progress.
• Announcements for file name and file types when browsing folder and file lists.
• Improved callout reading.
• Fixed use of color issues for views switcher.
• Updates to the Help documentation.
2- Customized web parts: The compile time for customized XSLT files used for Content Query, Summary Links, and Table of Contents Web Parts is improved.
3- Encrypted Connections: SharePoint Server 2016 supports TLS 1.2 connection encryption by default.
4- Fast Site Collection Creation: By using a template, they're now able to create Site Collections in 1 second. This compares well to SharePoint 2013 that takes up almost over 40 seconds sometimes. This will require a level of configuration with PowerShell to set up.
5- Large file support: SharePoint Server 2016 now supports uploading and downloading files larger than 2,047 MB.
6- MinRole : MinRole is a new feature in SharePoint Server 2016 that allows a SharePoint farm administrator to define each server’s role in a farm topology.
The role of a server is specified when you create a new farm or join a server to an existing farm. SharePoint automatically configures the services on each server based on the server role, optimizing the performance of the farm based on that topology.
You can now install just the role that you want on particular SharePoint 2016 servers. This will only install what’s required there, but even better, it'll make sure that all servers that belong to each role are compliant. You’ll also be able to convert servers to run new roles if needed.
7- ReFS file system support : SharePoint Server 2016 now supports drives that are formatted with the ReFS file system.
8- Sharing improvements : The following list shows the sharing improvements that are available for SharePoint Server 2016:
• Create and Share folder
• Sharing Hint
• See who the folder is shared with when viewing a folder
• Members can share
• Improved invitation mail
• One-click email to approve or deny a request for access
• Recently Shared Items cache
9- SharePoint Search: SharePoint Search supports indexing of up to 500 million items per Search Server application.
10- SMTP Connection Encryption: SharePoint Server 2016 supports sending email to SMTP servers that use STARTTLS connection encryption.
11- Web Application Open Platform Interface Protocol (WOPI) : You can now rename files, create new files, and share files from within the WOPI iframe on the browser page.