I did see the 6moons review and from that, it appears (by photos and deduction) to primarily be two Octaves in parallel, with additional logic for the new inputs provided.
Also, I don't like how the single ended outputs now require a transformer. Technically speaking, transformers are not where it's at. But I realize that the sum of all parts could be something special. (maybe I read that wrong, it seems crazy) (unless that's effectively the low pass filter in this output)
I do like that Cees is not using the same old topologies, chips and methodologies that all the other vendors seem to be permutating through.
I've had my Octave, driven by the AP directly connected to the SPDIF RCA input (wish it was a BNC) for about a year now.
Can't find anything that can touch it. Don't like the surreal sound of upsampling..
BTW, in case you have not discovered it yet, driving a TUBE preamp with the Octave sounds unbelievable. In this config, the tube preamp acts like the perfect low pass filter for the filterless Octave.
I'm using a SP17.
RM