SCE RTM
What is Essentials?
Essentials 2007 is a new management solution in the System Center family of IT systems management products specifically designed for midsized businesses (up to 500 PCs and 30 Servers). Essentials 2007 provides a unified management solution that enables IT professionals in midsize organizations to proactively manage their IT environment with increased efficiency.
You can download the evaluation from the main web site : http://www.microsoft.com/systemcenter/sce/default.mspx
I'll update with links to pricing once available.