I’ve just tried to install SharePoint 2013 Preview on a blank Windows Server 2012. The problem: The prerequisite installer had a lot of problems.
First of all, ASP.NET 4 could not be installed. After some digging around in the log file I found that the setup failed on this line:
"C:\Windows\system32\cscript.exe" "C:\Windows\system32\iisext.vbs" /enext "ASP.NET v4.0.30319"
I had to install "IIS6 Scripting Tools" manually. Additionally I had to install "Windows Identity Foundation 3.5" manually via "Add Roles and Features" within the "Server Manager".
Now SharePoint 2013 is up and running on a dev VM.