Now you know the date though, you're probably turning your attention to a collector's edition, right? Well, Sony's just detailed it.
The Gran Turismo 5 collector's edition in the US will run you $99.99 - but despite the high price, you get a ton of goodies. Let's just rattle them off: an exclusive 1:43 diecast model 2009 Nissan GT-R Spec V with custom Gran Turismo livery designed by Polyphony Digital, produced by Kyosho; an in-depth, 300-page car guide written by the fine folks at Polyphony Digital, detailing the history of the car to driving techniques; a custom-etched Gran Turismo key-chain; a voucher for exclusive high-end cars and liveries; a certificate of authenticity; custom packaging.
That's a lot of stuff. Sounds perfect for the audience. Apparently stocks are limited so you might want to get your preorder in now. There's more information through here.