The previous iPod kit available for 2008 and older vehicles replaced the AUX jack in the glovebox. It could only connect to iPods or iPhones and the folders and songs were only displayed in the multifunction display in the insturment cluster.
The new iPod/MP3 Media Interface Cable will replace the old system. This cable has plug-ins, for the iPod and for any MP3 Player! The display will now be on the Command (Navigation) screen and should be much easier to use. I saw it work on the 2009 SL. This will be part of the Premium 1 Package for all of the 2009 SUV’s, the SL’s and the CLS’s.