As far as the sampling rate indicator, I only stream with mine but find that it always shows 44k/Red, but mine is only used with the Bluesound Node and I think the Node only outputs 44.1, as even when I use Sonos optical out to the Bluesound then to the Cutest, for Pandora only, it still shows Red. I cannot find anywhere on the Bluesound if it upconverts everything to 44.1 or not.
As far as as SACD, I don’t think any player will digitally output anything above 44.1 or at least my players don’t. I think they set that as a copy protection default.