Microsoft released the ADO.NET Entity Framework Feature Community Technology Preview 4 (CTP 4). For developers who're not familiar with the ADO.NET Entity Framework Feature project, Microsoft is working to provide a collection of features designed to add on top of Entity Framework 4. "This preview includes the first release of Productivity Improvement work along with updates to Code First feature. Code First changes include: improved relationship configuration in the Fluent API; support for Data Annotations to configure the model; extended default conventions to reduce required configuration," Microsoft explained. Microsoft has put together two walkthroughs designed to highlight the changes introduced with Community Technology Preview 4.
ADO.NET Entity Framework Feature CTP4: Download