The Crowfall site has been updated with a new post called "Meet the Monsters" that reveals the final three races of the game. Minotaurs, Centaurs and Guinecean are detailed including their Racial Runestone buffs as well as their passive abilities and which classes/genders are available for each one.
Centaur Runestones offer the Trailmaster out-of-combat movement speed increase as well as Rear Kick when behind an enemy. They can also choose an Active Power from these four: Dash, Wild Charge, Strength of the Legion and Hippoctratic Oath. Female Centaurs will be available. Centaurs can be Knights, Champions and Clerics.
Minotaurs' Racial Runestone provides a buff to Dexterity and a passive that keeps them from being stunned wwhen hit in the direction they are facing. They have two Active Powers to choose from: Leap and Bloodthirst. Minotaurs can be Rangers, Champions and Myrmidons.
Guinecean Runestones offer a bonus to Dexterity and Intelligence, an increase to the bonus they receive from eating as well as a bonus Ring equipment slot. Active Powers include Leap Roll, Guinecean Burrow or Saltpeter Rounds. Guinecean can be Knights, Clerics and Duelists.
You can check out the full post on the Crowfall site.