Yup unless you've read it somewhere else, read it here for the first time! I read it in toyfare magazine.
Sigma 6 main 6 will be.... Duke, Snake Eyes, Scarlett, Heavy Duty, Tunnel Rat and a new guy named Long Haul. Wait what about that Spirit figure?? Well he'll make regular guest appearance as the article goes.
So we have it here, the typical team, the leader(Duke), the mysterious guy(SE), the girl, the kid or funny character (TR), the tough guy (HD) and Long Haul who probably be the driver guy...