The next version of ADO.NET includes a higher level of abstraction for data programming, thus reducing mismatches in data models and between languages.
The ADO.NET vNext CTP was announced last August on the ADO.NET blog: "Announcing: The ADO.NET vNext August CTP".
Download the August CTP.
For more information, review The ADO.NET Entity Framework Overview and visit the ADO.NET vNext page on MSDN.