YES, IT IS A TUSKEN RAIDER.
THE REASON WHY ANAKIN RETALIATES ON THE TUSKENS IS BECAUSE IN FACT THEY KILLED SHMI.
WHEN HE FINALLY GETS TO SEE HIS MOTHER AFTER YEARS OF TRAINING, SHE HAS VERY LITTLE TIME TO LIVE. SHE HAS JUST BEEN ATTACKED BY TUSKEN RAIDERS AND SHE DIES IN ANAKIN'S ARMS. THIS UPSETS HIM TREMENDOUSLY, DRIVING HIM INTO "TAKING CARE" OF AN ENTIRE FAMILY OF TUSKEN RAIDERS WITH HIS LIGHTSABER.
SHMI WAS THE ONLY LINK KEEPING ANAKIN CONNECTED TO SANITY . ONCE HIS MOTHER DIES, HIS ANGER AND FEAR STRONGLY START TO WORK ON HIM, QUICKLY DRIVING HIM TO THE DARK SIDE.
I ONCE HAD THE WHOLE PLOT FOR EP 2 POSTED AT ANOTHER SITE BUT IT WAS QUICKLY TAKEN DOWN BY "SUPERIOR FORCES"..OH WELL, NOW YOU KNOW..
I HAVE READ THE ENTIRE PLOT AND ALL I CAN TELL YOU IS THAT THIS MOVIE IS GOING TO ROCK...JUST WAIT AND SEE!