Your official information source from the .NET Web Development and Tools group at Microsoft.
To solve this problem, I created a Visual Studio Extension which will install the templates that we shipped with VS2012.
Note: This Extension is by no means supported by Microsoft. It is something I created in my own spare time to make it easier for WebForms developers using VS2010SP1 to use the updated templates that we shipped with VS2012
http://visualstudiogallery.msdn.microsoft.com/ec79e369-51bd-4212-83d0-71349d038461 has more details about the Extension and also what SKUs are supported.
Please do give feedback on the VS Gallery for the extension for any features/bugs.