Pops: I can picture the 6.2, it'll have the same basic layout as the 3.7 (a little taller and deeper I'm sure) but feature a midbass driver in that expanse of baffle between the woofer and the coaxial mid/tweet. The 7.3 will be similar to that, except even larger, and with a 12" woofer and passive radiator instead of 10". Probably these two speakers will have cast baffles made of something thinner yet stiffer than built-up layers of machined MDF, and the cabinet, at least in the 7.3, could be made from horizontally-stacked, die-cut ply layers, rather than scored and bent MDF as in the 3.7. A wild-card possibility is a triaxial compound driver. But it wouldn't surprise me if somewhere along the line, JT goes ahead and makes the logical but radical departure, using integrated digital crossovers and multi-way class-D amplification for an optimized system approach, maybe incorporating completely molded or otherwise non-wood cabinetry that does away with the furniture-appearance constraint on design and materials options.
