I recently obtained an invite to the Cataclysm Beta from Wowinterface.com. Since I'm an author there I was able to register fora beta key tracking ID and was soon thereafter bequeathed an invite to the Cataclysm Beta. So I thought I'd take some time to go over the changes to date with Elemental.
Spells and Abilities
The primary rotation hasn't changed, we just have more tools to work with on the move.
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This is a great little on the move blast of fire that gives us a little more edge to our movement periods. Spiritwalker's Grace (which is not available yet as the level cap is currently 83) will help even more so, but given that it's slated for a long cooldown it can't be relied on heavily. This adds a wonderful little button to press while on the move to buff the next Lava Burst, which becomes a larger percentage of overall damage done during heavy movement fights.
Unleash Elements will also make a great round-off to a rotation where Lava Burst will come off too fast for another lightning bolt. It will probably be optimal to save this ability for a Lava Bust regardless since the extra 20% damage will definitely be best applied there.
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A cooldown prevents you from spamming it, but in the 5 second window you'll find a few GCDs to reapply totems and fire nova before earthquaking again. You have to make sure and ghost wolf a good distance away when employing this strategy as one or two mobs sometimes seep through and chunk down at your channeling if they aren't knocked down so proper placement of totems and earthquake are essential to pulling this off.
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The tooltip in game currently reads 0%, but this is probably a tooltip error only as deploying the totem does appear to significantly reduce pushback on casting time. I'd imagine the actual percentage is comparable to the Paladin version.
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#showtooltip
/stopcasting
/cast Lava Burst
Before making this simple macro I suffered from jittery movement spikes and clunky keybindings in an attempt to stay on top of Lava Burst. As the proc is from the Flame Shock DoT component the proc can happen at any time during the rotation and often in the middle of a lightning bolt cast. The above macro helps to ease the quick transition from one spell to your refreshed Lava Burst.
One nice side effect that I hopefully won't get to used to before I start upgrading my gear after release is the interaction between Lava Surge and the tier 10 set bonus. With the DoT extension component I'm able to easily keep Flame Shock up indefinitely on a training dummy. In fact doing this is so effortless that I don't expect to be casting more than one Flame Shock per boss fight once 4.0 hits.
Though I suspect this will change once Cataclysm gear starts outstripping Icecrown loot. At my current gear level (about 50/50 split between 264 and 277 pieces) I've only upgraded a few off-set pieces like boots and bracers. I suspect level 85 dungeons and heroics will change that, stripping off the tier 10 anomaly quickly.
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It acts like a mobile, more powerful Healing Stream Totem, and the mana cost is manageable for Elemental, especially given how mana is even less of an issue than it has been in the past at this point in the beta.
The area of effect is actually quite large so for any fight where parts of the raid clump up in one area this will be a great tool to alleviate some pressure on overtaxed healers.
Rotation
There are two major things that will modify the rotation for Cataclysm: Unleash Elements and Lava Surge.
Lava Surge being the heaviest element of change, it will add a little bit of unpredictability to the rotation. Since it can pop at any time it will become paramount to maintain a Flame Shock debuff at all times, so when Lava Surge procs you won't have to spend an entire GCD sitting on an active Lava Burst while reapplying your DoT.
Unleash Elements can be looked at in two different ways; a good rotation round out or an on-cooldown nuke and Lava Burst buff. Finishing out a rotation smoothly to get out a Lava Burst on cooldown is important to maximizing Elemental DPS, but Lava Surge adds an element of unpredictability to Lava Burst's cooldown. The proc doesn't happen during every single Lava Burst cooldown, but often enough that rounding out the rotation may become less of an issue.
As I haven't tested the dungeons extensively yet it's hard to predict much more about how the gameplay will evolve during beta. At the moment the level cap is 83 so the full picture is still out of focus slightly.