The override has been there all along (I was hoping it wasn't), I just 
forgot to put it in my sample code.  The callback instance is defined as:

dispatch.execute(someAction, new MyCallback<someActionResult>() {
   // implementation of a couple abstract methods from MyCallback

  @Override
  public void handleException(SomeException ex) {
    // do actual work here
  }
});

Not sure if it matters, but the callback code above is behind an 
application split point.  
We're using GWT 2.4.0.

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