We're speculating now. Emile said several digital output options will be supported on the card, including SPDIF. If you can live with 24/192 and DSD64 via DoP a DAC having that input should/could play from the new Taiko card.
This might might prove to be a (surprising) step above the sound quality of even higher resolution files via USB. The card plugs into the Extreme"s motherboard, it eliminates some cabling, it takes advantage of the Extreme's excellent power supply which will only get better with the BPS. Finally, Taiko can optimize their code to get the best sound quality specifically for digital or analog output.
But I'm speculating now myself. The proof will be in the listening.
Steve Z