Based on Stephen Lang’s comments to Slashfilm, it sounds like the villain will have a much different story in the Avatar sequels and one that actually digs into his psyche as a character.
The Quaritch we saw in 2009 was very much a standard villain.
He was inflexible in his views, and the only thing that really changed over the course of the movie was the amount of force he chose to exert to achieve his desired outcome.