Straight shaft and light. That's it. We use Camp but there are others around. You will keep the axe on your pack most of the time (until Lhotse Wall and summit).
We carry a light 15-meter glacier rope at all times. Most people don't. We bring it for rescue or crossing unsafe places. Or in places of missing ladders and/or fixed ropes. We also tie in to each other if there are no fixed ropes at dangerous sections.