Here's what EARTH 2 writer, James Robinson, had to say:
Helena Wayne has been taught how to be the perfect Robin. Assured as a detective, fighter, scientist, pilot and all around crime-fighter she’s been groomed by Batman to be the perfect caped manhunter (or should we say manHuntress) when she grows up.
Are you getting excited for EARTH 2? Apparently next week's HUNTRESS #6 will give some clues as to how she ended up on the "New 52" Earth.