Don't know if this is true or not, but there is no reason why a version couldn't be designed to fit in the new machines.
The DD agitators already fit on an agitator shaft that is just like the original belt-drive's shaft, only shorter. The mounting splines are either identical or nearly so.
The DD's agitators have been engineered to fit into the VMW washer, however I always thought that those agitators were designed for short-stroke agitation, and a more belt-drive like agitator might be more effective in the VMW with its much longer strokes. So, very possibly, a belt-drive like agitator could very well be on the way for the agitator'd VMWs.
The common Roto-Swirl is probably too short for the VMW, but one could certainly be modified. The old super-tall Roto-Swirl used briefly in the late 1960s to 1973 in large capacity Kenmores might fit the VMW nicely, geometry-wise. The ramp would make an interesting wash action in a VMW.
Gordon