I'm setting up a new Server 2012 environment. I setup several folder redirections in group policy to point to U: \\ad01\FolderRedirections\%username%\ then mapped the U: drive to the the same location in GP.
I applied the GP object to the OU with all of the users in it, logged onto the Remote Desktop server (2012) and the drive letter wasn't there, nor were any of the in \\ad01\FolderRedirections\%username%\(documents, pictures, etc.) created.
gpresult /r indicates that the folder redirection policy was applied.
I also logged into a new laptop that I just joined to the domain and that didn't get the U: drive either.