Update files-whats-new.md

Author: jeffpatt24

articles/storage/files/files-whats-new.md

@@ -14,6 +14,19 @@ Azure Files and Azure File Sync are updated regularly to offer new features and
 
 ## What's new in 2024
 
+### 2024 quarter 4 (October, November, December)
+
+#### Azure File Sync v19 release
+
+The Azure File Sync v19 release improves performance, security, and adds support for Windows Server 2025: 
+- Faster server provisioning and improved disaster recovery for Azure File Sync server endpoints
+- Sync performance improvements
+- Preview: Managed Identity support for Azure File Sync service and servers
+- Azure File Sync agent support for Windows Server 2025
+
+To learn more, see the [Azure File Sync release notes](../file-sync/file-sync-release-notes.md#version-19100). 
+
+
 ### 2024 quarter 3 (July, August, September)
 
 #### Soft delete for NFS Azure file shares is generally available