Here's a tenative class progression for the barbarian. I've only defined any new or changed abilities. The rest are per the PHB. I'll need to reword the abilities later. I only put up a quick definition at this point. Changes to the standard progression have been bolded for emphasis.
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1 Fast movement, illiteracy, rage 1/encounter
2 Uncanny dodge
3 Trap sense +1, Rage (Mettle)
4 Rage +2 rounds
5 Improved uncanny dodge
6 Trap sense +2, PounceRage (Damage Reduction)
8 Rage +4 roundsGreater rage
12 Rage +6 roundsRage (Improved Mettle)Rage +8 roundsMighty rage, Rage +10 rounds
Rage: Per the PHB with the following exceptions: the barbarian can use rage once per
encounter instead of per day. Instead of gaining a +4 bonus on Constitution, the barbarian instead gainst a +2 morale bonus on Fortitude saves and a number of temporary hit points equal to double his hit dice.
The moral bonus to fortitude saves increases to +3 at 11th level when the barbarian gains Greater Rage and to +4 at 20th level when he gains Mighty Rage. His temporary hit points increase to triple his hit dice at 11th level and four times his hit dice at 20th level.
As the barbarian gains levels, the duration of his rage increases. Every four levels, his rage lasts two rounds longer.
Rage (Mettle): At 3rd level, the barbarian gains Mettle when he is raging.
Pounce: At 6th level, the barbarian gains Pounce.
Rage (Damage Reduction): At 7th level, the damage reduction gained from barabrian class levels is doubled while raging.
Rage (Improved Mettle): At 15th level, when the barbarian is raging, he gains Improved Mettle. This works exactly like Mettle, except on a failed save, he only takes the partial effects instead of the full effects of the spell or ability.