Support for a Multi-National Corporation tenant to have users be distributed across multiple Data centres for Skype for Business Online in the Multi-Tenant environment to provide better media quality by reduced latency.
This is a really big deal, at the moment your office 365 tenant is in one location globally, this will allow you to “regionalise” the Skype service, bringing conferencing closer to users reducing latency and the distance across the network/internet traffic has to go.
Meeting Migration Service for Skype for Business Online
Skype for Business Meeting Migration Service is the automated process that will update a users meeting coordinates for their Skype for business online meetings in Exchange online meeting requests after a migration to the cloud or a different region.
Today if you move from Skype for Business Server to Online, you can migrate your meetings with a client side MSI tool. This sounds like a new ability to do it automatically on the backend.
Cloud PBX support for Exchange Server
Provides the ability for customers with Cloud PBX in Office 365 to have their Exchange Server 2013 or 2016 on-premises act as a repository of their voicemails
Today, if you are a Cloud PBX user, you only voicemail option is Cloud Voicemail using Exchange Online. Some customers want to use their on-premises Exchange server to receive and store their voicemail; this feature sounds like it will allow that.