One new epic ability/epic talent I would love to see is one where you restore some health after defeating an enemy. It would restore a percentage of your health so that it is always useful regardless of level. I would say somewhere like maybe regaining 10%-20% health for defeating an enemy, depending on rank (1, 2, or 3).
The names could be something like:
Melee: Victory Rush, Adrenaline Rush, etc. Magic: Mojo Drain, Mojo Leech, something like that. Ranged: Second Wind (Bonnie Anne/Eagle Mercenary already have a power with this name, but it's all I can think of)
I think such an epic ability would go great with the Buccaneer player class in particular. They've already got Bladestorm.
buccaneer: flanking and relentless musketeer: burst fire and over watch and crossfire witchdoctor: witch hunter and cowards bane and counter spell swashbuckler: cheap shot and flanking privateer: repel boarders 2 and second chance