When you select it a ranged weapon is mailed to you. Turns you into a "petless" hunter of sorts with all the same rogue mechanics, though changed somewhat for ranged - so it might do away with a few that require specific positioning.
It would open up the loot table and would make playing a rogue more interesting. Maybe dump assassin spec for it, I dunno. Don't really play a rogue, just a thought experiment.
(Thinking dumping assassin because of a rogue as an implied sniper, killing from long range.)