It only displays the Filename or foldername, however this should be enough. It doesn't auto scroll when the text is too long, but I'm guessing the CD controls that (rather then the radio buffering it) so that the radio modules could be identical between the MP3 and non-MP3 versions.
FYI I've got one of the MP3 ones, so I'll verify that the adaptor works. I seriously doubt they'd change it since they'd have to redesign the radio for the MP3 version.
Jazzymt, I thought I read somewhere that you were trying to determine what the other pinouts were on the ribbon cable, any luck with that? Is the mute a single line or digital?