The New Adult Genre-- what is it?

New Adult emerged when young adult readers wanted protagonists to represent their ages of eighteen through twenty-eight.  They're discovering who they are and figuring out the best way to become independent.  They fall in love, but their relationships can't swallow them up.  Sophisticated New Adult readers are cognitively demanding. Stories are darker, antiheroes go up again immoral governments, but goals are not ambiguous.  Readers want realism and demand multiple plot threads to stay engaged. Information is deliberately withheld in order to increase tension.  I am enjoying the rewards of writing for a smart culture.