This beta is a significant engineering milestone for the team. We’d obviously like to get as much feedback on the product as possible and you can see and give feedback on the beta through the Windows Server Essentials 2012 Beta Essentials forum. We are working hard to deliver Essentials 2012 this year and so your feedback on the beta will be critical to us over the next few weeks as we work towards a release candidate and an eventual RTM.

See the entire post at http://blogs.technet.com/b/windowsserver/archive/2012/07/11/download-the-beta-release-of-windows-server-2012-essentials-today.aspx.