Hi,
This download link received today, and as I see – the branding of new Visual Studio is little bit different (logos a design in general ) from VS2012 Beta. According to Microsoft, the performance was improved, all the improvements can be seen in this comparsion table.
The bad side of a new and a glamour VS 2012, that we again need to update our operations system: for an example, Beta was installed on my Windows Server 2008, and the RC is only for next version – Windows 7/Server2008R2/Windows8 RC/Windows Server 2012 RC.
Supported Operating Systems
Windows 7 (x86 and x64)
Windows 8 Release Preview (x86 and x64)
Windows Server 2008 R2 (x64)
Windows Server 2012 RC (x64)
Well, we are waiting for the release 
Yonathan Masovich.