They could potentially make a healer who strikes the ground and elements come out and provide buffs/heals. Bring back stoneskin, haste(wind) healing waters, vines for slowing enemies etc. similar to how summons in FFXI used to buff parties. I don't think they would have even showed the picture at all if the hammer was a mistake or not going to be implemented in some way, a healer this xpac most likely not, but it would be nice.