In SQL 2012 RTM, in Master Data Manager home page, there is a link to MDS Excel Add-in. However, the link is broken. However, as my good friend Allan Mitchell pointed me, you can download it from SQL Server 2012 feature Pack site – http://www.microsoft.com/download/en/details.aspx?id=29065.
In 2012 RTM MDS Configuration Manager, there is still button for enabling DQS integration. However, the button is disabled, and you cannot use it. Do not worry, it is not necessary anymore. The button should simply be removed.