1. Encryption
SQL Server 2008 R2 supports MD2, MD4, MD5, SHA, or SHA1 hash algorithms for encryption of you data. The new release add support for SHA2_256 and SHA2_512 algorithms. You can use HASHBYTES function as previous version.
2. User defined server role
One of the new security features added to Denali is the ability for user now to add user defined server roles which wasn't possible in the previous versions. User can now create, drop, alter user defined server roles.
3. SQL server security model
Users don't require logins when access to contained database is permitted. This is a big change and an area that needs to be looked at properly. To understand how this is implemented you can get more info Designing and Implementing a Contained Database
4. New permission
Due to the addition of user defined server role, there are also associated permission. Permission to grant, deny and revoke on user defined server roles.
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