If TD releases an ST based on their V3 buggy, it will dominate. They are the only company addressing the issue with rear traction people are having in MM configurations.
They have moved the motor closer to the rear axle, and mounted the shocks to the front of the rear arms. The MM helps give the weight bias you need, and the portion of the truck/buggy behind the shocks will help plant the rear in straight line acceleration. The MM weight bias will still give you the steering and front end stability you need.
Losi has moved their motor the furthest forward from the rear axle, and hung the the shocks at the rear. And they are having to add brass or lead weights to get it to hook in MM, or build it in RM.
Kyosho. Has hugged a little closer to the rear axle, but have hung the rear shocks all the way to the rear.
AE has moved the rear shocks to the inside of the tower, giving it some reward weight on them, but still mounted them to the rear of the rear arms. Motor still closer to the rear axle than Losi, but also a sideways battery that helps shift weight for more forward bite.