Burnout Paradise has to be the game this side of the sun with the most updates ever planned for it. We already know about the Bogart update as well as the Cagney but there's also the Davis and the Eastwood. What each update contains is outlined below:
Cagney: extra multiplayer modes, 70 new freeburn challenges, a Live update page with calendar/event interface chich reeks of the OS X from Apple of all things, new leaderboards for co-op play, the Hunter Olympus vehicle, new support for SD players, 1080i support for the PS3, the buggy Avril Lavigne content on the PS3 disc will now be rectified, eg. custom soundtrack support.
Davis: night racing and motobikes - awesome
Eastwood: Paradise City will be getting an expansion outside of its borders.
We believe the Bogart and Cagney updates will be free of charge but there is no official disclaimer as yet.