Microsoft has released ADO.NET Entity Framework Beta 2

This beta contains updates to the ADO.NET Entity Framework since the ADO.NET Entity Framework June 2007 CTP release. Key changes include:
Events to customize code generation
Abstract types in EDM models
Complex types
Using; support in metadata files
Entity key serialization
Increased persistence ignorance in entity data classes
Improved connection management in ObjectContext
Improved DataBinding usability
Metadata annotations
Better support for span over LINQ to Entities queries
Improvements to LINQ queries: additional canonical functions and automatic mapping from CLR functions to server functions
A new event for extensibility of SaveChanges
Usability and consistency improvements
Polymorphic results from stored procedures

IMPORTANT: Read the steps in the instructions below in order to install the ADO.NET Entity Framework Beta 2.

ADO.NET Entity Framework Beta 2