The Language Integrated Query framework (the LINQ Project) is a set of language extensions to C# and VB and a unified programming model that extends the .NET Framework to offer integrated querying for objects, databases and XML.

LINQ’s query operators can be applied to any .NET array or collection of objects, effectively providing SQL- and XQuery-like capabilities for in-memory data. Essentially query-capabilities become a first class citizen in .NET programming languages. In addition, LINQ provides two critical APIs code-named:

DLinq: for SQL relational data access
XLinq: for XML hierarchical data access

也就是传说了很久的COmega，真正落地的咚咚，而且进行了增强和扩展，确切的说应该是C# 3.0/VB 9.0

目前还没有公布，会在13号的PDC 上公布

msdn.microsoft.com/netframework/future/linq/