Honestly, it is a unique and really useful looking machine, but this is the only way I would buy a DMG Mori. Especially one that was new. Hand over some of your models and make the PO contingent on an accuracy, runtime, and reliability guarantee, as well as a runoff on your floor during instillation (demonstrating runtime and part accuracy). Mid to Big Ass companies do this for almost every piece of equipment they purchase, even something like a Speedio or Robodrill that is a 100% known quantity for a decade.
I don't think it will be anything like the M200/M300. The whole Brother M series is really dedicated to automotive folks doing post-processing of round, cast components. Think alternator housings, diff covers, gearbox covers, hubs, EV motor caps, etc etc. The reach issues everyone complains about are a positive design feature for the folks who buy these - they want to swing a relatively large, lightweight part in as small a floor footprint as possible. Doesn't matter if you need to run long ass tools as the cuts being made are typically very very mild, and an M machine obliterates the process time because it eliminates a lot of handling.
I think the Brother 5 axis is going to be, like the DMP or an Okuma M460 5Ax, basically a 3 axis machine with the table replaced with a trunnion. Think: S500 castings/enclosure, with the new D-00 control, all the automation options carrying over, and who knows, perhaps Brother figured out a way to significantly increase the number of tools in the turret?