Looks like all SP original recordings are "uploadable" using the RH1, including optical and analog source SP, SP mono, LP, and LP4 bitrates.
See the image below (this was taken from the MDCF forum post by the MDFreak in the Netherlands who has an RH1 to play with from Sony for a few weeks.) Very nice to see it can happen.
I am so excited about this that I am taking my trusty MZ-S1 unit with me to the Wanee again this year since I will later have the ability to digitally upload anything it captures down there. I usually keep my RH10 and RH910 in tandem so I always have 180+ minutes of PCM recording available. The MZ-S1 will be at the other stage with my buddy and hopefully we can find a good patch output for it.
This is really good news and great confirmation.