Additionally, the PSN version has gained the "Retro Pack," with 20 more single-player missions and new speech banks and other content, and the "Time Attack Pack," with even more race missions to play through. Some of that content was presumably already in the Xbox DLC that arrived last month, so now PSN players can enjoy it as well, at a price of $4.99 each (with extra discounts for PlayStation Plus members).
All three packs are available right now, and Team 17 is promising more new content packs to come. You can browse through screenshots of all the new content below. Happy wormin'!