Why the heck did they put Tobey and Rachael at the cast list?

I dont understand this! Yeah I heard that they were going to take the leading role on this film.. but the rumor was denied later by their fansites. And now... they put them on! I was thinking oh! perhaps it was true at the end. but i see another cast there! so. what´s going on here? Will IMDB correct this huge mistake? also because i saw the trailer and NO Tobey and Rachael there!
Too bad. They would have made a very cute couple.