Off the top of my head, I can rattle off a slew of functionality in Scala that's not in Java:
* Regexp literals
* partial/curried functions
* for comprehension
* argument defaults
* case classes (and switches thereon)
* tuples
* combinators
* XML interpolation
* Mixins
* Fine-grained visibility
Caveat: I'm no Scala expert. Some of this may be in the libraries and not the language proper.
Now... what Java functionality can you name that's not in Scala?