"Mechanics of Rebirth" on page 10 of Races of the Dragon is pretty detailed, in my opinion, as to what gets kept and what gets lost. You keep your type, you keep your racial HD, you keep your speed(s), languages, favored class(es). You lose this:
You lose all other racial traits of your original race, including bonus feats, skill bonuses, attack bonuses, save bonuses, spell-like abilities, and so forth.
If a human loses its bonus feat and skill points, seems pretty obvious (once again, in my opinion) that you'd definitely lose AC bonuses, fast healing, DR, etc.