IBM finally released CR2 for IBM Connections 4.5
You find more details and download links here.
One fix is the hard coded wikis toc strings. Will test it.
Update #
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You have to update FNCS to 2.0.0.1-FNCS-IF001. Document contains a short description of the update procedure (Do not forget to read the whole document! Backup the files, because you have to restore them later).
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Cognos and Metrics Database needs some changes.