http://www.elle-fanning.net/ , http://www.dakota-fanning.org/ and http://www.wonderfuldakota.com/ all tell us that Dakota and Elle are both going to be in an upcoming move called My Sister's Keeper, featuring Cameron Diaz. The movie is based on the novel by Jodi Picoult with the same name. Elle's character is called Anna, and Dakota's Kate.
Nice to see the girls in th same movie!
 

http://www.elle-fanning.org/ has some screencaps from a behind the scenes featurette from te movie Babel. In the featurette Elle holds a speech, and the site will add her words to the quotes page soon. So keep your eyes open! :-)
Also, there's a bit from an interview with a woman playing Elle's grandmother in the movie "THe Curious Case of Benjamin Button". It seems Elle is playing the young version of Cate Blanchett's character (if I understood things right)! 
 Screencap from the site

According to http://www.elle-fanning.org/ , Elle has got a role in the tv-series "Dirty Sexy Money", where she will be playing Peter Krause's daughter. Not known yet if it is a rregular part or not. The site describes the plot of the series, and has some pictures from the trailer to the first episode. 
 screencap picture from the site