The public update for the Service Pack 2 expiration date issue is now available for download. 

The update can be applied before or after Service Pack 2 installation.  If the update is applied prior to installing Service Pack 2 it will prevent the expiration date from being improperly activated during installation of Service Pack 2, if it is applied after Service Pack 2 it will remove the expiration date incorrectly set during installation of Service Pack 2.

More info here