I'll just list the changes in links below along with my thought on them. So maybe it'd make the discussion more convenient. Some of the links are might not shown because I link it from wowhead. You can always check the more comprehensive notes here and the new talent here.
New Stuff
Fire Nova - Wonder if this spell is really coming back, because it doesn't listed on wowhead.
Fulmination - A new change to Fulmination.
Epicenter - Returning of WoD's CL perk with a new name.
Tremor Totem - Nice to have this back.
Molten Fury - Tier 1 (lv 15) talent. Personally I'd prefer Totem Mastery over this one.
Volcanic Rage - Tier 2 (lv 30) talent. Additional aoe spell. Doubt it'd perform great, if it's not just make our aoe rotation more clusterfckd. I even think that EQ damage should've just worked like this. Burst damage on the first impact then followed by small dot.
Spirit Wolf - Tier 3 (lv 45) talent. Might be useful on some cirscumtances, like on levelling maybe.
Earth Shield - Tier 3 (lv 45) talent. Unlike resto's ES in honor talent, this one doesn't have the damage reduction part. I doubt if this shield will actually help our survivability.
Nature's Guardian - Tier 5 (lv 75) talent. Another returning old stuff, after we got the ghetto replacement on our Artifact trait.
Seismic Armor - Tier 5 (lv 75) talent. I can see this maybe added for pvp purpose. But it doesn't necessarily great defensive tools. It might even worse with the EQ changes.
High Voltage - Tier 6 (lv 90) talent. Replacement of Power of The Maelstrom artifact, maybe in even better version.
Electric Discharge - Tier 7 (lv 100) talent. See new Fulmination above to understand this talent better.
Stormkeeper - Tier 7 (lv 100) talent. I think it should has lower cd, seeing it's no longer buff the damage like what we have currently and it also has one lesser charge. I say 30 secs cd would fit better.
Changes
Flame Shock - FS has cd at 6 secs. It's a shit change. Idk what they're thinking, but I just feel like this'll raise our target-switching issue all over again. Hopefully this won't get to live.
Capacitor Totem - Cd is increased to 1 min, and stun duration is reduced to 3 secs. Pretty harmful change to pvp.
Earth Shock - It also has the cd back at 6 secs. Wonder if it reverted back like the old time where all Shocks are sharing same cd (really wish it's not). The damage modifier is also changed, and it's really a huge change. Seeing how new Fulmination work, ES might no longer be our burst spender like we have now. Maybe it'll be more like a damage amplifier of sort. Not a fan of this change tbh.
Elemental Mastery - Tier 2 (lv 30) talent. Interesting change, but I wonder if it actually a passive rather than a cd skill.
Earthquake - It's changed to be like Moonkin's Fire of Elune talent, except it can't be relocated. Might be good on pve. But definitely a worse change on pvp especially arena. With that long cast time, I don't even think it'd be synergize well with Seismic Armor new talent. I'd be long dead before I can cast it out, while I hard casting the shit with those melees rape me big time.
Fire Elemental - Shorter duration and cd. And it's also good to have additional perks on it.
Storm Elemental - Dat new perks tho *_*.
Removed
Elemental Focus - Wonder if it'd be impactful.
Ancestral Swiftness - Going to Enhance exclusive.
Voodoo Totem - Meh.
Path of Flame - Not a real deal to me
Elemental Fusion - Not a big deal to me as well. Not a real game changer on pvp to me, I mean rng is rng anyway.
Gust of Wind - Going to Resto only. Another shit change.
Earthgrab Totem - Also going to Resto exclusive.
Icefury - RIP pvp.
tl;dr - I see some interesting changes. One of them is "Full Lightning Build" possibility (High Voltage, Storm Elemental, and Electrical Discharge or SK). I can imagine with a mastery haste build and Bloodlust, we'll be channeling LB like a tesla coil at huge SE stacks on our burst stage. Not a fans of Gust of Wind removal and FS ES changes. But this is early preview of Alpha stage. Many changes will come eventually. So we'll see about it.
Let's discuss!