The F#/C# ASP.NET MVC 4 template has been updated to support ASP.NET MVC 4 RC and Visual Studio 2012 RC. You will need to install the release candidate of ASP.NET MVC 4 to use this updated version of the template. The install can be found at http://www.asp.net/mvc/mvc4.
As with the previous release, the F#/C# ASP.NET MVC project template supports ASPX and Razor versions of an empty ASP.NET MVC 4 project template as well as a Razor version of the ASP.NET Web API project template. The templates work on both VS2010 and VS2012 RC.