Just got off the phone to tescos (store NOT website), here follows the convo:
"Hi, just a enquiry for the release date of Grand Theft Auto 4 on the PS3"
"It says here its the 24th, but I'll just check that" *taps away on keyboard* "Oh it seems to have been moved to the 29th, So we'll probably get them in on the 28th and we wont be able to sell them until the 29th"
"Ok, thanks very much *mutters profanity under my ...
It does, when you earn all the normal trophies you get the platinum for that game.