Humans get bonus critical chance, wits and bargening. They also get Encourage which heals slightly and boosts stats temp.
Lizards get bonus persuasion and intelligence. Get a bonus fire spell.
Dwarves get bonus strength and stealth. Bonus spell that can petrify an enemy.
Elves get bonus finesse and something i forget, they can also eat body parts to gain health and new abilities. Bonus ability that gives more damage at the cost of CON for a few turns.
The undead are completely unknown.