None of these can really be considered sleepers;
Knocked Up - 40 Year Old Virgin was a sleeper, people are expecting this to be good, plus it has Katherine Hiegel, one of the stars of one of the top rated TV show on air right now.
Surf's Up - CGI cartoon with penguins, c'mon, kids will be begging mom and dad to take them.
Ocean's 13 - Both the first two were hits, this is expected to be a hit too
Fantastic Four: Rise of the Silver Surfer - The first made $150 million domestic, second should be able to make that much if not more
Evan Almighty - This could be the only one that might be considered a sleeper, but Steve Carrell is really popular now, a movie star and TV star
Transformers - Huge built in fanbase, Michael Bay dumb action movie (unlike The Island, which tried to be too smart)
The Simpsons Movie - The Simpsons may not be as big as they once were, but it's still a huge franchise
Bourne Ultimatum - Bourne Identity, $121 mil, Supremacy, $176 mil, sleeper? No
Rush Hour 3 - Rush Hour $141 mil, Rush Hour 2, $226 mil, only thing that might make this a sleeper is the time between movies
All the movies are probably expected by the studio to make over $100 mil, a better poll would be which will bomb