The cloud version or CRM Online is going to be first to get a number of
new updates, sometime in the coming weeks. Microsoft will make those
same updates, plus some additional features, available via an
on-premises version of its CRM release.
According to this Microsoft roadmap slide, unified provisioning, billing and administration, as well as identity federation and in-region
disaster recovery support are all coming to the online version only. The first three of those capabilities are all related to the integration of CRM Online with Office 365.