An Ain't It Cool News reader sent in a story from the Albuquerque Journal which indicates that The Avengers will be squaring off against the alien races Skrulls and Kree. Here's a quote from the article:

"The Avengers script will blend Iron Man, Thor, and Captain America: The First Avenger story lines as The Avengers battle with two alien races, the Skrulls and the Kree."
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This information wasn't attributed to any particular source, although the main focus of the article was about The Avengers filming in New Mexico next year, which we reported earlier this week. The Avengers will also shoot in New York and Michigan next year, with production expected to start in April.

This news of the Skrulls and the Kree has not been confirmed as of yet, but we'll keep you posted with any further news on The Avengers as soon as we have more information.