While we're still waiting on the Bogart update, we're already hearing good things about the future Cagney update. One such major inclusion in Cagney is the ability to play custom soundtracks while cruising Paradise City.
To play a custom soundtrack, all a player needs to do is enter the Easydrive menu, go to "Soundtrack," and then hit "Custom." This will bring up an XMB page where they can select songs to play in modes like shuffle, repeat, or by group.
While this feature is a welcomed addition, the Cagney update has yet to find a fixed release date. This means that the ability to play custom music is, well, still a promise that's far off. The Bogart update is only releasing this April 24 but was revealed way back at the beginning of March. If we can expect to see a similar timeframe, Cagney could still be a month or two away.
Burnout Paradise custom soundtracks to come in Cagney update
12

