Click the following links to read about new features in the SQL Server 2012.  All the links go to the TechNet Library.

What's New (Database Engine)
What's New (Analysis Services)
What's New (Integration Services)
Introducing Data Quality Services
What's New (Replication)
What's New (Reporting Services)
What's New (Master Data Services)
What's New (SQL Server Installation)

Click the following additional links to download the release, try new samples and tutorials, or find out what are others are saying in the SQL Server forums.

SQL Server 2012
Tutorials and Samples
SQL Server Forums