Jeff,
Current SACD players can't play multi-channel SACDs. (At least the multi-channel track.) You need a special multi-channel SACD player for that. It will have 6 analog outputs only.
dCS will probably do like Sharp and Meridian and use a proprietary interface that will only work with their products. I hear Sony does not want a digital interface for SACD.
The 861 already has a multichannel input card, the IA40. It has two pairs of 6-channel inputs.
that's what we expect from Meridian right?
I would not expect Meridian to support SACD.
I currently have the Pioneer DV-38a DVD-V/A player. It has 6 analog outputs for DVD-A.