GameStop now expects to have Shattered Memories in stock on December 8. GameFly, whose dates tend to differ from official ones by a few days, lists the Wii game as being available November 26, but the PS2 and PSP versions on December 31. Wal-Mart's dates put the Wii version at November 24 and the PlayStation games on Christmas Day (which is probably not the real ship date, on account of there not being any mail delivery that day).
Basically, the game is coming out later. It's not in stores right this second. That's all we can say with any degree of certainty.