Read the complete blog @ https://techcommunity.microsoft.com/t5/SharePoint-Blog/Organize-your-intranet-with-SharePoint-hub-sites/ba-p/174081
Microsoft first disclosed SharePoint hub sites during Ignite 2017. And today, we are pleased to announce that they are now rolling out to Targeted Release customers in Office 365. We are encouraged by early adopter feedback and can’t wait for every customer to use and adopt them.