Square Enix has a lot on the line with Final Fantasy XIII. The game has supposedly been in development since 2003 when it was planned as a PlayStation 2 game. It was re-started in 2005 for the PS3, and fans have been dreaming of the awesomeness of the game since 2006's excellent Final Fantasy XII. I'd say expectations are running high.
"There is an unusual sort of pressure on Final Fantasy XIII," the game's producer Yoshinori Kitase acknowledged to EDGE magazine.
In terms of sales, that pressure amounts to stratosphere-high expectations. "I'd say we need this game to have ten times the success of these smaller titles," Kitase said. "But I don't think that means we've compromised in terms of the game design or creativity in any way. Indeed, the development of the game has very much followed in the tradition of the previous titles in the series, welcoming input from the full range of development staff."
Given the long, long history of excellent Final Fantasy games, and what we've seen so far of this title in particular, I think ten times the sales of lower-profile Square games is more than doable. I think it'll happen. Just check out the reveal trailer: