Latest .NET 4.0.3 features are as follows:

• Compensation for custom hosts
• SqlWorkflowInstanceStore on SQL Azure
• State machine workflows (including designer support)
• SQL Server Express Local Database Runtime support in SqlClient
• AlwaysOn support in SqlClient
• New assemblies in .NET Framework 4 Portable Class Libraries
• Correlated Connection ID in SqlClient
• Sustained low latency in garbage collection
• Windows Workflow Foundation messaging activities enabled across multiple hosts
• Support for running workflows in partial trust