There shouldn't be a Hunstman prequel, but I guess every movie needs the story before and the story after to clear up all the things we were left puzzled about. Based on First Showing here is the synopsis:
As of now, there aren't a lot of specifics on the story, but the prequel takes place before Snow White ever crosses paths with Ravenna and will follow the huntsman Eric as he is sent on a quest to find the stolen magic mirror, which puts him on a path to face something from his past, in addition to the evil Snow Queen (Blunt), the sister of Ravenna (Theron). No word on how the dwarves will come into play this time around, but we'll find out sometime down the road. Cedric Nicolas-Troyan will make his directorial debut on the film with a script from Frank Darabont most recently, and the film arrives on April 22nd, 2016.
Okay, well if that's the case, then I am on board. It is always fun to stare at a screen with Chris Hemsworth-ness plastered across it.