It seems Need for Speed Undercover will not have all cars available in the retail version. 2006 Koeniggsigg CCX, 2006 Dodge Challenger Concept, 2007 Porsche Cayman S, 2007 BMW Z4 M and 2007 Mercedes SL 65 AMG will be available through a Collector's Edition Upgrade which will also include over 40 exclusive vinyls, 10 pre tuned cars and twelve new circuit, sprint and checkpoint track configurations. Price is currently unknown and the downloadable is only confirmed for PS3.
Additionally there are plenty of instant upgrades available starting at $1.75 for a street package unlock to $10 for ultimate performance package. Those of you who can't be bothered with playing the career can get things instantly unlocked for a small amount of money. The whole list of items on the PSN is available here.
