[url=http://db.planetdestiny.com/items/view/560601823]Black Hammer[/url]
Its impact is notably higher then Icebreakers (32 while Icebreaker's is 25) and it has the new perk "White Nail" with the effect "Rapidly landing three precison shots will refill the magazine."
This means that even though you only have 3 shots in the mag, it is functionally infinite once you are landing only precision shots. The dps this will have on bosses is crazy.
I think people are going to be praying for this drop and it will be a "must have". Especially since it frees up your exotic spot. THe only thing Icebreaker has on it is that it's much more forgiving and you don't need to land precisions.
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Until you know HoW when it's damage will remain at 331, while IB will have an upgrade.