I'm testing the install on both 2012 server and 2012 R2 (both RTM) and I couldn't install .net 3.5 without giving the installer two separate sxs folder based on server version. I added a folder sxs\2k12 and sxs\2K12R2 in the prerequisites folder and added code to check for version and use the appropriate folder in the .net install function.
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