It's not every day games go "platinum" before they're even released. Generally, this occurs with huge titles, but even taking that into account it's an uncommon feat. Factor into that the notion that a game whose title explicitly states it's a Prologue to a full game ... and it's nearly unbelievable. But in Europe alone, Gran Turismo 5 Prologue has achieved just that: one million pre-orders.
What we need to remember is that the pre-order number is not only for Europe alone, but also just for the Blu-ray release of the game -- not the downloadable version. If half of the people who intend to purchase the game pre-order it and the other half download it, well, this is going to be huge. Add America and Japan into the mix and we've basically got the best-selling PS3 title to date; at least, that's what we're assuming will happen. What about you?