Regarding Denon 3rd Link. There is still an ongoing issue and the crux of the matter is that the SACD spec states that SACD can only be transmitted over IEEE 1394. Well, while all parties (Universal, Sony, etc) are fine with the idea of Denon Link 3rd Edition passing SACD, their are some legal issues (and tie ups) in getting the necessary approval to essentially "violate" a spec.
As such, the hangup is on the DVD player side - not the receivers (the newer models already fully support SACD over Denon Link 3rd). Jeff Talmadge from Denon is preparing a documetn for us that will address this in more detail - but for now SACD will need to go over analogue (or IEEE 1394 if you have a new AVR-5805 or other receiver with support for IEEE 1394).