GC just posted on the EU forums an answer to a destruction warlock question for a single target buff. Guess this applies to elemental shamans as well:
Q:Appreciate the update Ghostcrawler, but still waiting on news of a buff for Destro single target damage.
A: As I said above, it makes more sense for us to implement mechanics changes before we tune all the numbers. Otherwise, you throw out all the tuning work every time you make another mechanics change. I will post when we've finished our 5.2 tuning pass so you guys have a chance to offer feedback.
We think Destro may be a little behind, but it's not much. Affliction PvE damage is too high, which causes many warlocks to go Affliction on every fight rather than considering options. That creates a big sampling bias effect on sites like World of Logs and Raidbots. The lower performing DPS specs appear even lower than they actually are because the only players generating those logs are uninformed (which also tends to mean undergeared) or just messing around. To get a more accurate test, you need to see a player try every spec under similar circumstances (gear, skill, etc.), and those data are much more rare.
The 2nd part doesn't really apply to ele as we can't switch to enhance without gear, whereas pures can.