There is good news, Microsoft have released the SharePoint 2016 in a preview version on 24th of August 2015. Before the Ignite 2015 event Microsoft announced the release about next on premise environment SharePoint 2016 will become generally available on Q2 2016 and public beta is planned for Q4 2015.
After couple of months, there is a word spread over the world that beta version of SharePoint 2016 version would be proponed to August 2015 instead of Q4 2015. And the time comes on August Monday 24th; a link to the “Announcing availability of SharePoint Server 2016 IT Preview and cloud hybrid search” article is spread over the twitter, then I realized a public preview of SharePoint 2016 got released to the public.
A video talks about the availability of SharePoint 2016 preview
Here, I have listed the available download links from Microsoft download center
SharePoint Server 2016 Preview
Link to ISO file format of SharePoint 2016 preview Installation file.
SharePoint Server 2016 IT Preview Quick Start Guide
This quick start guide provides an overview of SharePoint Server 2016 IT Preview requirements and installation to support Single Server Farm installations
SharePoint Server 2016 IT Preview Reviewer Guide
The SharePoint Server 2016 IT Preview Reviewer Guide provides an overview of new capabilities in SharePoint Server 2016 IT Preview.
SharePoint Server 2016 IT Preview Datasheet
The SharePoint Server 2016 IT Preview Datasheet provides an overview of new capabilities and investments in SharePoint Server 2016 Preview.