As Manus pointed out, they split the processing load. The DVD players (598 and 800V3) decode the formats into 6 channels and pass that out to the processors (800V3 and 568V2) over 3 SPDIF or the 15-pin and then the processor does upsampling, bass management, and time alignment. Why? Because they have to have DSPs in both, I guess they might as well use up what is in the DVD player. DSP in DVD player is there for MLP decode and most likely MHR. This will free up processing in 861 for more work.
8-channel Trifield upsampling does happen with any source plugged in, but that is just 2-channels.
If you could take another DVD player and either add 3 SPDIF outputs or put their 6-channels of analogs through and A/D and then into 568 with 15-pin, you could get upsampling.
Of course Meridian could always build a box to do this. This would be similar to the IA40 and IA45 cards that do an A/D. This might be useful for those with 568 and have an SACD player.
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