extends and implements

[%u]

Hello.

I know D isn't Java, but one trivial thing I liked about Java is
the introduction of 'extends' and 'implements' as keywords as ways
to clarify the class relationships when defining a class.  You
know:

class Subclass extends SuperClass implements AnInterface {
...
}

Will they ever add this in to D?  If not, why not?

thanks.