Heroic logs are now working (for fights except Norushen), so the initial batch of overall Raidbots data is out, and it's fairly surprising.
http://raidbots.com/dpsbot/Overall_D...00000000111111
Shaman right now are in 4th place in heroics, and are coming in behind Monks, Druids and Disc Priests. For all of the complaints about Shaman needing to be nerfed, it appears that Shaman dominance really only is a normal mode phenomenon. In HM, we are middle of the pack at best, and are highly likely to slip as people overgear the fights more and our mastery is further degraded.
Another thing to consider is that trinkets and tier are going to push us further behind. We gain far less from the cleave/multistrike trinkets than Monks or Druids, because they don't affect a good 40% of our output (they do not cleave/multistrike off water totem healing), whereas other classes are showing 5%+ throughput gains from them. We have a 2 piece that is decent but does not credit us with throughput, and a 4 piece that is completely terrible, whereas other classes like Monks and Druids gain 6%-10% output gains from 2 piece + 4 piece. I would not be surprised if we lose 10%-15% relative strength because our 4 piece is useless and we lack the trinket scaling of other classes due to terrible trinket design.