Microsoft has announce organisations running on-premises SharePoint will be to direct user site creation requests to Office 365 services via a new SharePoint  Server 2013 feature called "Hybrid  Self-Service Site Creation.”

The new capability is enabled following installation of this  month's Public Update release for SharePoint 2013, according  to an  announcement by Bill Baer, senior product marketing manager for  SharePoint at Microsoft.

New with the March 2017 Public Update for SharePoint Server 2013 is the option to Create Site Collections in SharePoint Online.

“When selecting this option any hybrid user that goes to the Self-service Site Creation page (/_layouts/15/scsignup.aspx) will be redirected to SharePoint Online Group creation, and will be able to create a Group and associated Team Site in the Cloud using the new modern group creation flow,” notes Baer.

“Hybrid users are defined through inclusion in one or more audiences as configured when enabling the hybrid sites feature in SharePoint Server 2013.

"This new hybrid capability allows administrators of  SharePoint Server 2013 to have the option to enable their existing or new Self-Service  Site Creation flow redirect users to SharePoint Online to create a Group (with  an associated Team Site)."

There is the ability  turn on or turn off Hybrid Self-Service Site  creation using SharePoint 2013 Central Administration, Baer added.

Microsoft expects to make the hybrid self-service site creation option available SharePoint Server 2016 in the second half of 2017.