Sorry if this has been discussed. I looked and couldn't find anything.
The dungeon call to arms gives and extra reward for the least represented role at the moment and someone in my trade said the call to arms was implemented for the dps, but I can't see that being true since dps the the role thats mostly sitting in the queue.
So I guess I'm just missing something, but from what I know about the system currently it seems like we'll never get the extra reward.
Sorry again. I have a feeling it's been discussed quite a few times and that it's just my searching skills that fail me.