With Disc officially going half DPS, half heals, I would like to see Enhancement go this route honestly. One of the original draws to the class for me back in Vanilla was being able to provide all of the buffs via totems, and 'Totem twisting'. It was a little weird mechanically, but I felt like there was more identity there in that Enhancement provided really interesting shit to your group... Shamans overall even. Windfury Totem, Grace of Air, Strength of Earth, Stoneskin, Bloodlust, etc.
Since all of the class buffs are covered now, maybe having your attacks Rockbiter/Flametongue etc providing a group buff when used. And using a combo of them creates a bigger buff.
What I'm picturing is Enhancement utilizing the 4 elements: Air, Water, Earth and Fire with specific attacks:
Air (Windfury passive)
Water (Frost Shock active)
Earth (Rockbiter active)
Fire (Flametongue active)
When your Windfury procs you get a temporary buff that interacts with your next attack.
Air + Water/Ice - If you use Frost Shock it causes an Ice Storm at an enemy or if you use a heal it makes a Healing Rain.
Air + Earth - If you use Rockbiter it surrounds you and your allies with Stoneskin shields.
Air + Fire - Give you and your allies lightning strikes which is basically like an old Windfury totem or Stormlash
Those are just quick examples anyways.