As you know, sometime ago Microsoft has introduced Office 365 Groups as new collaborative services.
You can now define on SharePoint Online Administration portal if an Office 365 or a classic SharePoint site can be created.
This administrative option is available from the SPO administration portal, below the Settings section under the Site Creation option
- A site with an Office 365 group or a classic site
- A site with an Office 365 group – will work only if the user has the permission to create an Office 365 Groups
- A classic site – Office 365 Groups can still be created from other location if the user has the permission to do so