The Windows Server 2012 Release Candidate was made available for download on Thursday at 4:12 pm.
Microsoft Windows Server 2012 Release Candidate (RC) Datacenter is Now Available
Thanks for downloading Microsoft Windows Server “8” Beta. The next version of the product, Windows Server 2012 Release Candidate Datacenter, is now available. You can download the latest version from TechNet, which includes resources to take advantage of all the features of this pre-release version.