GT5: Prologue gets three new cars
Sony's patched GT5: Prologue with three new cars, according to this Eurogamer piece, meaning you can now get your hands on the "GT by Citroen" concept car, the Ferrari California and the Lotus Evora.
Apparently there's also tweaks added to the penalty system, race events and other miscellaneous bits and bobs.
More info through the link.