Almost missed it: Download the SharePoint 2013 Preview !
Download Microsoft SharePoint Server 2013 Preview (Download here)
SharePoint Server 2013 Preview is designed to bring people together to get work done. Whether you’re using it to manage your enterprise content, make it easy for business end users to share ideas and information, or help developers build innovative new applications, SharePoint Server 2013’s improvements in scale, security, and flexibility have you covered.
The Product Key and the requirements are listed on the Get Started Page page.