Bleeding Cool's "good sources" have revealed a huge potential spoiler about Thor: The Dark World, which is shooting right now in Bourne Woods in the UK. According to these sources, a major character will be killed off in the movie. Now while a superhero movie death can mean about as much as a comic book death, this would still be considered a big story spoiler if true, so skip the next paragraph if you don't want to know who might be buying the farm..
These sources were "pretty sure" that it would be the Allfather himself, Odin, who would kick the bucket. However, Bleeding Cool then go on to say that they are less sure now than they were at first. In other words, it could be anyone! This isn't surprising really, as the stakes are always raised in movie sequels, and main characters tend to be killed off to heighten the drama. If this is on the level, my money is on one of the Warriors Three.