It isn't exclusive to 2012. It is exclusive to the product its self.
If the product will only run on 2012 then it is exclusive to 2012, but otherwise it will work fine on 2008 R2.
If the product will only run on 2012 then it is exclusive to 2012, but otherwise it will work fine on 2008 R2.
http://blogs.technet.com/b/windowsserver/archive/2012/05/30/...