Little Big Planet is a game that really deserves to sell well.
It's daring, new, innovative, beautiful... much like ICO, in my mind. An art-game.
Setting it apart from that game is the online community, and the party-feel (multiplayer!) of the game. It has also recieved more hype, though not much. But I still believe it has a limited appeal to the PS3 owners (assumption), and that it will appeal mainly to the 'beyond hardcore' group.
Given the currently somewhat limited userbase of the PS3, I would say that it will open pretty badly (around 100k), and continue selling around 15k/week or so for a while, reaching maybe a million and a half lifetime (at best).
Then again, I really hope I'm totally wrong and it'll become a smash hit. Gaming needs new blood.
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