On viewtopic.php?f=20&t=56807 All sorts of modified and new rage feats for barbarians are listed.

Are they all separate, and thus, do they all stack together?

Do any of them, such as unyielding rage, replace other rages such as standard rage?

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Osiris Masud

Once you acquire the rage widget from the appropriate NPC you can change from the default Amia rage to Ferocity or Unyielding. When out of combat and not raging you can change between the three as much as you like.

Those three rages run off the barbarian basic rage so they only stack with the epic Terrifying/Thundering/Mighty rages.

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Whomst've'll'd'mn't I play:
Salema Nefahri :: A penny for your thots
Zrae'a'stra'fryn :: That which nightmares are made of
Khasir :: From the East a storm is coming

You get to choose between Standard Rage, Unyielding Rage, and Ferocity Attack.
Mighty Rage, Thundering Rage, and Terrifying Rage will all be added to whichever rage you are in and will stack with each other, if you have the feats.

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THREE