VERY interesting. Now the discussions will start instead of "I wonder". And we'll all learn something. I second Paul with some of his questions. I would think that 80 watts of AB power would produce heat - especially if driven hard so I doubt you'd want to stack them.
Oct. 02 issue of Stereophile has an article by Sam Tellig about similar concepts in the PS Audio HCA-2.While it's not the same, it is good background info on these new generations of amps.
Sounds to me like it's an 80 watt amp with dynamic power up to 300 watts like you would get in an old Proton or an NAD amp today.
But it's getting interesting.