It's veeerrrry simple Blizzard.
New battleground, 15v15. Domination map.
Five platform floating above a pit of instakill lava with capturable resource nodes on them.
Dragonriding enabled. Dashing through an enemy player at just the right time/angle will dismount them and send them plummeting to their death. Maybe have some anti-air turrets players can jump in to try and shoot down other players.
Very. Simple.