With the reintroduction of talents I would like to see the possibility of focusing on just one element per specialization.
I always thought that the shaman class itself is an elementalist, instead a vertical on specializations could allow you to specialize on an element or a combo of elements (fire, water, earth, air)
In this sense I would like to see the possibility of having:
Stormcaller:
Air + water (ice)
Caster DPS where you can cast filler (windslash or lighting bolt) to load power and spend it on thunderstrike (single massive dps) or storm (aoe)
chainlightning applies a debuff that allows you to apply the lightning rod and the individual abilities also affect the one with the debuff.
Geofury
Earth + Fire
Meele dps using earthstrike applying rock stack on enemy, flameshock and elava lash fuse debuff to do massive damage and apply an extra dot,
earthquake when you hit with lavalash it goes to erupt magma which does additional aoe damage, and the mastery allows having accumulated stacks to summon volcanoes near enemies.
Waterkeepr
Water + Earth
Healer who uses water as it is now and earth to protect and create shields.
These are just ideas but I would very much like to have a lightning themed remote caster and reverse the course of the fire.
The fire caster theme is already full with the wizard and the warlock and now we have dragons too.