It looks like Twisted Metal may include a PSN Pass after all, despite the hopes of director David Jaffe. According to The Gamers Hub, QA lead Justin Trease responded with a succinct "yes" during CES when asked about the inclusion of a pass. No other details as to what the pass will entail were mentioned, though typically the online pass model is used to restrict online content -- multiplayer, etc. -- to those who purchase new copies of a given title.
We've contacted Sony for confirmation. The publisher has more or less stated that all of its titles going forward will implement PSN Pass.