I think you're right; when skimming, I read the following section, which made it sound like they were updating it to send additional metadata, based on their mentions of the "codecs" and how they "will" allow radios to do useful things with the metadata. Also, I'm used to codec meaning "software program", not "machine".

>>The NICAM distribution system also carries the RDS data. This will enable the radio in your car to automatically retune when you can get a better signal from a different transmitter. It will also display the station name (for example “Radio 1”) and the current song name (for example “Now Playing: Coming With You by Ne-Yo”). RDS will also indicate when a travel announcement is being made on BBC local radio so that a radio can switch to the travel announcement at the right time.