'streamstatus' afaict has been around for a while (it's also the second param in the /7.html response) and as it was in the v1 xml response, it was also in the v2.0 xml response and now the v2.2 json response (as i made sure things were mirrored).
there's some additions between v2.0 and v2.2 like the 'backupstatus' and 'dj' (which depending on if available will not be indicated) as i've tried to keep the output to just what is reliably known than dumping empty fields all the time unless really needed so as to save some bytes over the wire (along with most responses being gzipped if the requester supports it) so repeatedly getting stats should save people a bit (or two, heh) on their bandwidth allowances
