A Microsoft já deixou disponível como serão as edições no novíssimo Windows Server 2012 que deve estar disponível no mercado no fim desse semestre.
Ficou bem mais simples e muito mais fácil de entender 
, será apenas 4 versões, veja:
| Edition | Ideal for… | High Level Feature Comparison |
Licensing Model | Pricing Open NL (US$) |
|---|---|---|---|---|
| Datacenter | Highly virtualized private & hybrid cloud environments |
Full Windows Server functionality with unlimited virtual instances |
Processor + CAL* | $4,809** |
| Standard | Low density or non- virtualized environments |
Full Windows Server functionality with two virtual instances |
Processor + CAL* | $882** |
| Essentials | Small business environments |
Simpler interface, pre-configured connectivity to cloud based services; no virtualization rights |
Server (25 User Account Limit) |
$425** |
| Foundation | Economical general purpose server |
General purpose server functionality with no virtualization rights |
Server (15 User Account Limit) |
OEM Only |
Mais detalhes no link abaixo:
http://www.microsoft.com/en-us/server-cloud/windows-server/2012-editions.aspx
Álvaro Rezende
MVP Microsoft
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Álvaro Rezende 