Today we released SQL Server 2008 R2 -SP1
The following features are new in Service Pack 1 (SP1).
Data-tier Application Component Framework (DAC Fx) for improved database upgrades. The new Data-tier Application (DAC) Framework v1.1 and DAC upgrade wizard enable the new in-place upgrade service for database schema management. The new in-place upgrade service will upgrade the schema for an existing database in SQL Azure and the versions of SQL Server supported by DAC. A DAC is an entity that contains all of the database objects and instance objects used by an application. A DAC provides a single unit for authoring, deploying, and managing the data-tier objects. For more information, see Designing and Implementing Data-tier Applications.
More details: -
SQL Server 2008 R2 SP1 (go.microsoft.com/fwlink) can be used to update a SQL Server 2008 R2 RTM Express edition instance. Do not use Microsoft SQL Server 2008 R2 SP1 - Express Edition (go.microsoft.com/fwlink) to update a SQL Server 2008 R2 RTM Express edition instance.