It's very hard to tell and I think it may be something of a regional thing. The Dark Knight had great appeal for people who have read the comics, and also for those who have not. But I don't really see many people who have no prior knowledge of Watchmen going out of their way to go see it. I only know like 2 other people who have even heard of it before around where I live. People may go initially to see what it's all about, but I don't see the vast majority of them going back for multiple viewings. At least not around here...but hopefully it will have a big weekend! It deserves it!