This should probably be in the 260-310DKP range, as I think Sega is being slightly optimistic, though, the article says that Sonic Heroes sold a million copies in Europe alone, so it might be possible for this game, over the course of several years to be able to sell this many copies. Also, if they expect it to sell this well, I assume they will market the game heavily and supply retail chains with many units even before it is released. Also, if this game is good (which most previews seem to indicate it is), it could end up having a much longer tail and sell like New Super Mario Bros, Animal Crossing, Wii Sports or Brain Age do, keep selling years after it has come out. So from this, I think over this game's lifetime, a 260-310DKP range does not seem unrealistic.
4