Jesse,
Koffi Arana is his name. Hasbro said at the panel that 'he had a secret and we're not gonna spoil it for you but that a 'weapon' fits into his chest'. Yeah they're full of it though, just a little research in comic reading (graphic novel clone wars vol#9-not sure of individual comic book series). Anyhew...
Spoilers....
Spoilers....
Spoilers....
Spoilers....
If you look at Darth Vader you'll see a 'cortosis alloy' sword in the severed arm laying in his pack-in in the infamous 'prolonged 30AC wave'. What happens is Vader uses the sword to 'fly' this sword into Arana's chest(Vader already has his arm severed in the battle-a pretty awesome battle where it's vader against 8 Jedi at once, makes for good reading/viewing).
What I don't understand is several figues in the Prolonged video game wave go with the comic book wave of figs. Additionally, in the comic it shows the sword going into Arana just above the circular thingy on his chest. The toy however appears to have the slot for the sword in the circular thingy meaning an inaccuracy byt the manufacturer...I guess I'll wait and see if this gets fixed.
DS