New Shanks: http://i.imgur.com/UZBy0z3.jpg (credits mmischa)
Captain ability: Increase the chance of getting heart orbs | When your health is full, increase dmg of heart units by 2.75X

100% health, 2.75X
90% health, 2.67X
70% health,2.52X
50% health,2.37X
30% health,2.22X
10% health,2.07X
HP=1 ，2X
From secret and reliable sources... tested and proven.
Special: 35X of max dmg to all enemies. Reduce enemies def to 0 for 2 turns.
New Luffy: http://i.imgur.com/BvG0v7V.jpg
captain ability: increase dmg of red units by 2x
special: deal huge dmg to all enemies + boost red units dmg by 2x for 1 turn (quite insane imo)
New Sanji:

New Nami:

New Brook

New Chopper: