Many thanks to Little Bleeder Duncan for spotting something extremely interesting in the IMDb listing for The Avengers. Readers who want to remain completely in the dark about the plot of the film should probably stop reading right away.
*(POSSIBLE) SPOILERS BELOW*
The cast now includes Cobie Smulders as down for the role of Maria Hill/Anelle. If you've read the comics then you'll know that Anelle is in fact a Skrull.
This could mean two things. Firstly it could confirm the rumour that Skrulls will be involved in the plot of the film. Secondly, since Anelle is listed with a human name as well, there may be a twist that reveals the Skrulls have infiltrated SHIELD. Or is this all just a trick that they're using to torture us during the long wait for the film's release?