This just passed thru my inbox so I thought I would pass it along.
New feature: SharePoint Online hub sites
We are excited to release SharePoint Online hub sites, a new building block of the intranet. SharePoint Online hub sites bring together related sites to roll up news and activity, to simplify search, and to create cohesion with shared navigation and look and feel.
This message is associated with Office 365 Roadmap ID: 21036.
How does this affect me?
SharePoint hub sites enable you to organize your intranet by associating multiple team sites and communication sites together. This is an optional feature that has no effect on the user experience unless hub sites are created.
You can use SharePoint Online hub sites to organize concepts, teams, divisions, or resources throughout your organization. It is easy for you to create one or more hub sites by converting an existing site to a hub using Microsoft PowerShell. After a hub site is created, site owners can associate existing team sites and communication sites with the hub site.
We'll be gradually rolling this out to Targeted Release organizations in late March and we anticipate rollout completion to all organizations by mid-May.
What do I need to do to prepare for this change?
There’s nothing you need to do to prepare for this change. Please click Additional Information to learn more. https://techcommunity.microsoft.com/t5/SharePoint-Blog/SharePoint-hub-sites-new-in-Office-365/ba-p/109547
Rollout of Hub Site should begin March 21 to 10% targeted release tenants. We cannot roll this feature out to targeted users. We will monitor feedback and usage on a weekly basis. We anticipate to be 100% prod by mid-May.