52w ago - Sony Associate Product Manager Ken Chan has posted up a GT Academy 2012 PS3 update today which covers how and when to unlock prizes for competitors.
To quote: Welcome to week four of this year's GT Academy competition! By now you've probably learned the basic fundamentals of the racing line, variable high-speed cornering, continuous elevation changes, and multi-radius acceleration, all while trying to maintain the highest grip possible to maximize corner exit speed.
If you achieved a Gold Trophy in all five events within a round, you will unlock the GT Academy-spec Nissan used in the trials of that round. Prizes will be distributed one week after the online competition of GT Academy ends, which is on or after July 4th, 2012.
Here are the four cars you can unlock in Rounds 1 through 4: