If a soundtrack is available somewhere purely for streaming alongside a physical/download release, then I usually just add that as an "Available at" link with a note that it's streaming only, like here:
http://vgmdb.net/album/30259. This is kind of interesting because Dikiciyan put up a bonus, streaming-only track, though.
I'd be okay with getting rid of this and linking to the streaming player on the iTunes release. (The DJ mix is already mentioned in the notes there.) Lots of composers post this kind of streaming stuff on their sites as demos.