It could be good, or not.

One point about it is that this form does not explicitly specify the
order of the iteration.  Therefore I would only use it in cases where
that is the intent, and even in that case, explicitly specify the type.

<code>
int main() {
  int numberArray[] = {
    100,
    200,
    300,
    400,
    500
  };
  for (int number: numberArray) {
    cout << number << " ";
  }
  return 0;
}
</code>

prints: 100 200 300 400 500
....  or does it?
why not: 300 200 500 400 100
....  ?

We really need a loop like this, or better yet .. one that supports
parallel operation.  This would have been a good place to introduce it.