Which versions of PS3 will decode SACD and DolbyHD?

[iMetal]

Apologies if you've seen this question many times before. I'm one of many consumers looking for a single transport to handle my existing SACD collection, as well as future BD collection (especially as it becomes viable as a surround-sound music format). The PS3 looks like it -might- be capable (and the only player in the world currently capable -- yeah thanks Sony) of this, but some mystery remains.

I am aware that PS3 (as with many other players) decodes its hi-res audio internally, then spits it out over HDMI as linear PCM. Not a problem.

What is not clear is if there are versions (and only certain versions) of the PS3 that can decode both SACD surround and DolbyHD discs. My understanding is that DolbyHD is something that came along later, while SACD is something that went away. (Based on this page.) Almost as if the former has replaced the latter.

So, any definitive info on this would be extremely appreciated.