SharePoint Server 2016 will become generally available in Q2 2016

This news is regarding release dates of SharePoint 2016.

Microsoft confirms the release of SharePoint 2016. SharePoint 2016 will be generally available in Q2 2016. Public beta of SharePoint 2016 is planned in Q4 2015.
 
Microsoft also confirms the on-premises releases of SharePoint. 
 
SharePoint Server 2016 will deliver enhancements and new capabilities in three major areas:
  • Improved user experiences
  • Cloud-inspired infrastructure
  • Compliance and reporting
Microsoft also started inviting companies for TAP (Technology Adaptation Program)

http://prereleaseprograms-public.sharepoint.com/Pages/BusinessProfile.aspx
 
For more details please have a look at blog post