For LINQ (LINQ to Objects), Java 8 will have something equivalent, see Project Lambda.
It has Enumerable's LINQ to Objects extensions like stuffs. But for more complicated LINQ things like Expression and ExpressionTree (these are needed for LINQ to SQL and other LINQ providers if they want provide something optimized and real), there is not any equivalent yet but maybe we will see that in future :)
But I don't think there will be anything like declaratives queries on Java in future.
