Elemental, looks from the streams, that it plays just the same with some really good features added. Earthquake stacks fast off of chain lightning. There is no issues of getting earthquake down when you need. Echoing Shock mimics a spell again 1 second after you cast(on alpha it is twice but the talent says once). The talent stacks well with Stormkeeper so you can get these nice moments of chain lightning spam off for aoe which feels really good and looks really good.
Elemental shaman also has two really great Covenant choices:
Kyrian: Vesper totem. Which does a strong aoe pulse for 3 spells/abilities and also has 3 charges for healing to help spread heals. If you wanna blast out 3 chain heals.
Necrolord: Primordial Bolt which does shadow damage and puts another flame shock out. So it helps spread more flame shocks which then plays into its main ability which causes your next Lava Burst to hit all targets affected by flame shock.
Elemental shaman looks like it plays remotely the same with these really new moments that feel great.