Bioware have leaked a recruitment video for the Sith Warrior. So far it has only been available in low quality at gamespot, but I manage to snitch a high quality version and uploaded it to youtube:
As nail-biting as the trailer is, that is not all. Notice at 1:15 of this exciting video trailer, the Sith Warrior is driving a speeder bike. What does this mean? Are players going to have vehicles in SWTOR? We do not have the answer, but given the footage in this trailer, the answer looks positive.