SharePoint 2019 Preview has recently been released by Microsoft!
Quick summary of the cool new features and improvements:
- SMTP authentication support is added (previously, you could only use anonymous authentication)
- New OneDrive sync client (not based on the old Office Groove anymore, finally!)
- Full integration with PowerApps and Flow
- Built-in PDF viewer
- # and % characters allowed, preventing sync errors when using OneDrive sync client
- Increased file upload size: 15 GB
- Modern search engine which presents results during typing
- and many more!