According to IGN, Sony has stated that the 45 Euro price is 'categorically incorrect' and that cost has not been decided yet.
The Netherlands based site PS3 Only have received pricing information from Sony in regards to the Blu-ray version of Gran Turismo 5 Prologue. According to the site, Sony has stated that the retail version of GT5 Prologue will run a slightly-expensive 45 Euros (about $60 American).
Though it might seem like a lot of money for a glorified demo, Sony was quick to point out that GT5 Prologue really is a full game, with over three dozen cars, five tracks and online play with up to 16 people. Also just announced was a cool new feature called GT TV, where gamers can download auto-enthusiast TV programs along the lines of Top Gear. According to PS3 Only, the programs will also be tailored for different regions -- so Japanese, American, and European gamers will all get localized content.
The addition of GT TV definitely adds some value to GT5 Prologue, but while it clearly has way more gameplay than GT HD it will be curious to see if gamers are willing to drop that much money on what amounts to GT5-lite. Gran Turismo fans are pretty hardcore though, so it's hard to tell.