Update: Hero of the hour, Streetmagix, has now unearthed the Xbox 360 Achievements for this Porsche vs. Lamborghini Need for Speed: Hot Pursuit DLC.
Mentioned in the Achievements are a Lamborghini Diablo, Porsche 911 Turbo, Porsche 959, Porsche 911 Speedster, Lamborghini Countach and Lamborghini Sesto Elemento.
Original story: Need for Speed: Hot Pursuit may be about to welcome a Porsche vs. Lamborghini Pack.
Eurogamer was tipped off by a reader who downloaded the free, automatic 300MB title update last night - bringing the game version up to 1.02.
After two hours of play, no discernible changes were found.
What was unearthed was a Trophy for taking three pictures of the famous Lamborghini Countach, plus the Porsche vs. Lamborghini Pack title.
Hot Pursuit developer Criterion used to push huge title updates upon owners of Burnout Paradise, evidently stuffed with upcoming DLC. The content was then unlocked by purchasing and downloading a small file from the PSN Store (or Xbox Live Marketplace).
EA was unavailable for comment at time of writing.