>>7638787I personally see them doing what the Legends class does. The vehicle mode has a lot of mass the robot doesn't really use, take advantage of that to just hide a set of wheels and then hide the treads in robot mode.
As for combined mode, the wheels will probably rotate to be Devastator's big grinder drum, since it's too much mass to just come from Mixmaster. I'm also half expecting Scavenger to include at least some of the combined head.