The title is to be shown behind closed doors only, so if you haven't got an invite you aren't going to see it.
Read more of the Press Release for more comments on the game.
"We have worked very closely with Rockstar North to bring the same integrity and production value of the previous Grand Theft Auto titles to the PSP system," said Gordon Hall, President of Rockstar Leeds. "People's expectation for a Grand Theft Auto title will always be very high, and we're confident that we can deliver a revolutionary experience. Grand Theft Auto: Liberty City Stories will be the most intense and epic title created for the PSP system, undoubtedly setting the standard for this groundbreaking platform."
GTA LCS is due for release this fall, after the European release of the PSP console, September 1st. We're looking forward to it.