SharePoint 2016 is all about hybrid possibilities that improve collaboration for the end users. Office 365 along with Sharepoint 2016 fetches results from both On-Premises SharePoint Search Index and Office 365 for the same search term. Try out SharePoint 2016 with an IT Preview test environment on CloudAppsPortal. (https://www.cloudappsportal.com/sharepoint/sharepoint-2016-features/)