Typeclasses are coming. And they will use them for growing the language such as operator overloading, collection literals, narrowing & widening types, etc.

I will be happy to take in new patterns: https://github.com/javaevolved/javaevolved.github.io/issues

I was bored so I came up with my own for comprehension: https://github.com/pivovarit/for-comprehension4j