From what I read, it seems to have the same features as the AVM 20. The difference is that it has upsampling to 192 kHz along with TWO Motorola DSP 56367 chips. I guess it remains to be heard if those factors figure in much better sound though how much is subjective. It looks very nice though.
The D1 also has 4 component video inputs instead of 2 for the AVM-20. I also believe that the D1's balanced outputs are full differential, whereas the AVM-20's balanced outputs are "just" true balanced (Info).
Wait- I understand "fully differential" to be referenced to *only* the DACs. I understand "fully balanced" to be the entire internal design. Input stage, processing, *and* output stage (including the DACs).