Just a tip. There are many components of Configuration Manager 2012 that rely on the Microsoft .NET Framework 4.x to be both installed AND activated. Plan now to make sure you are ready for the ConfigMgr 2012 implementation by identifying those computers and servers that may need to be upgraded.
The Microsoft .NET Framework 4 on the Microsoft Download site: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=17851
Microsoft .NET Framework 4 Client Profile (Standalone Installer): http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=24872
In the .NET Framework Developer Center: http://msdn.microsoft.com/en-us/netframework/aa569263
With the Framework installed, you can use the following command-line to enable or activate the Framework:
%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe –i –enable