The SharePoint Server 2016 preview is now available to download from the Microsoft website:

http://www.microsoft.com/en-us/download/details.aspx?id=48712

Note: Windows Server 2012 R2 is required

Brief on Install Instructions

  1. Review SharePoint Server system requirements
  2. Download and install full-featured software for a 180-day trial
  3. When prompted, use the following product key: NQTMW-K63MQ-39G6H-B2CH9-FRDWJ