From that computer rendering, it looks like the tweeter is enclosed in that horn like structure, the midrange above it is enclosed in a large chamber and the woofers below are in a huge open space with. So perhaps interior volume is increased and the skin is structural so it needs less internal bracing. Copper rods connect the front aluminum baffle to the rear metal baffle as in other models. The section of the front baffle has some blue rectangular structures and what look like extrusions which do not resemble the way the front baffle of the M Pro is constructed, which I have seen when helping to replace a tweeter. There is a lot going on in that image.