Late last year during the 2017 Microsoft Ignite conference, Microsoft disclosed that SharePoint Server 2019, along with other server previews, will be available in mid 2018.
A few of the features expected to be released in the preview include:
New Admin Centre and Migration Tool
You can anticipate a revamped SharePoint Admin Centre which displays file activity patterns, active sites and service health information on the home page. You will also find a Recycle Bin to recover previously deleted sites in addition to a compliance control which displays device policy controls, conditional access and data leakages.
Further, the migration tool is designed to move content from SharePoint Server sites located in your database to either SharePoint Online or the OneDrive Service.
With the addition of data residency and compliance capabilities for both SharePoint Online and OneDrive being coined as "Multi-Geo Capabilities in Office 365" you are positioned to choose regional locations for storing data and the search index.
Skype for Business versus Teams
There have been whispers and discussions around whether Skype for Business will be decommissioned and replaced with Teams, and this was clarified during the Ignite Conference.
At a high level, Microsoft is providing solutions for business who are either not yet ready to move to the cloud, have a deep investment in on-premise, or for organisations whom are disconnected from the internet.
With that being said, Microsoft announced that they will be deploying another round of Skype for Business as part of the Office Server 2019 upgrade.
The big picture goal however is to get users onto Teams, so they have provided the below as a guideline.
Other changes (Office 365)
For Office 365 First Release customers, a new development expected in the first half 2018 are the new Hub Sites. This feature assists in creating a more cohesive way to manage search and activity among similar sites. Further, creating an association between Team Sites and Communication Sites. This will be available to first release testers in early 2018.