If I remember correctly, only the Ultra is expected to accept multi-channel input, so far. But don't count on my clouded memories.
It's here, but my Ultra has been stuck in customs for 2 days while they dream up what to charge me. lol
I have some DSD256 files, but can not test since my DAC is hooked up optical DSD64 (DoP). would need to be USB to get 256.