This sounds a little bit like a rumor, but sources are reporting that Jessica Biel is in negotiations to play Thor's love interest in the upcoming movie adaptation of the Thor comics.
The character was not directly named, but is supposedly a character from the animated movie Hulk vs. Thor, which means it would be either Sif, a fellow Asgardian and love interest from the comic books, or The Enchantress, a sorceress that often battled Thor and The Avengers in the comics.
This seems similar to the Natalie Portman as Sif rumor, so check back with ReelzChannel.com for more updates!