I would love to see an update, as in 2 tracks and a few more cars i.e S2000, Sagaris and maybe a new manufacture like NOBLE, I dont see how this would slow down the release of the full game as they must already have hundreds of cars ready upto there standards and many tracks to choose from just sitting there stored on a PC lol, I dont see how this would stop people buying the full game either, I think maybe some of you guys have forgotten just how EPIC a full gran turismo is, I mean we are talking hundreds of cars and many many tracks, aswell as moddification options, many challeanges, enduro races, drifting challanges, the list is huge and that alone will dwaff prologue, If people payed for prologue knowing it was a teaser/demo of things to come then I'm sure they are going to buy GT5 soley on its size!
When it is released I'm sure prologue will die, its served its purpose and has passed the time for the major release, and as a comparrison to GT5 it will just look like a PSN demo you have downloaded