Data Compression Enhancement in SQL Server 2012 Is there any specific enhancements in SQL Server 2012 for Data Compression Feature? 

Last time I checked SQL Server 2008 R2 introduced support for Unicode characters so columns with NCHAR data types (excepts CLOBS and BLOBS) can now take advantage of compression technology in SQL Server.
There were under-the-covers performance enhancements (nothing concrete, see for example this book excerpt. Otherwise, no, 2008 R2 compression and 2012 compression are functionally equivalent.