The Demon Hunter appears to be an all female class, and she wields crossbows, often dual-wielding, to devastate the hordes of the burning hells. You can check out her page on the official site here, including some great amour-progression concept art, and her reveal trailer here or below.
I'm really liking the backstory and character set up, as she seems to be a rather interesting twist on the Amazon from Diablo II (the previous ranged combatant). I'm not impressed, however, with the reveal trailer; at least the narrative part of it.
I tend to prefer my fiction to be dark, gritty, and grounded in a measure of reality to enhance suspension of disbelief. The narrative aspects of this trailer are far too over the top for my liking; no real sense of danger and very, well, anime-influenced.
She can also continually fire while dual-wielding her crossbows without reloading.
Regardless, she looks like an awesome class, and I'll likely be using either her or the Monk for my first character.