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With a case length of 1.348" to 1.368" it sounds exactly like a 300 Whisper / 300-221 / 300 Fireball with a trim to length of 1.355". I'm assuming since they recommend AA1680 as the subsonic powder that the system uses a carbine length gas tube instead the pistol length. That is unfortunate as the pistol length has proven to be more versatile when switching back and forth between subsonic and supersonic.
As for the magazine problems caused by the bullet diameter that isn't anything new with AR shooters. I've found that a Pmag with the side rib removed is the best solution as opposed to loading ammo to a specific length. This also works well with my 7.62x40 which can't rely on overall length as the case is too long to allow such short loading.
Overall, I don't see anything new here. That said, I think it will be good for the cartridge family to have a SAAMI approved chamber and solid factory backing. I'm still waiting to see if the ammo is interchangable between the Blackout and the Whisper. From what I have read I suspect it may be.
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