Depends on how long sony bundles it I guess. If the bundle holds until Christmas, it is undervalued. If it stoppes in the near future (jun-july) it is overvalued.
@Rol83,OK good point. Personally i just don't think it will reach that. I'm on PSN and out of thirty friends id have to say only 2 of them got the prologue. Why would you buy the gran trismo prologue anyway. Its a waste of money especially since MGS4 + GTA4 are coming out soon. The only sales i can see from this are people who badly want the game + bundles. I can see only too things. Good prologue sales bad full game sales or vice versa.
You can't compare GT4:P with GT5:P in my opinion. GT4 was just an overworked version of GT3. Everyone was able to play GT on the PS2 (even if it was the "older" version). GT5 is the GT one for the PS3. Nobody wants to play the predecessor because it's on the predecessor console with the predecessor engine... A pretty huge part of the fanbase wants to play it now, even if it is just a demo version and even if they have to pay 70% of a full-game price. They will not wait another year (at least) to lay their hands on the final version. My forecast is 4 Million.
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What is your source?