Windows Server 2012 R2 build 9431

This build was released on 25/6/2013 through MSDN (screenshot). Later on, it became publicly avaliable through Microsoft Technet Evaluation Center. First it was thought to be released alongside the client build on BUILD 2013 at 26/6/2013, but it came a day earlier.

Remote Server Administration Tools
Alongside this build, a preview version of RSAT was released. Although it has the same build number, it reports a day earlier compilation date than the build itself.

Variants
When downloading from the Technet Evaluation Center, you can choose between an ISO, VHD (Core/GUI) and a Windows Azure version. VHDs are avaliable only in English, but the ISO was released in 12 languages: Chinese (Simplified), Chinese (Traditional), English, French, German, Japanese, Korean, Portuguese (Brazil), Russian, Spanish, Swedish and Turkish.