Via this source, Chanel is launching a new lipstick line, Rouge Coco. According to the site, the formula and pigmentation of the lipstick has changed and the case is now made entirely of metal. The site pins the release date for March 2010.
Chanel’s promo pictures seem to suggest that Rouge Coco substitute for the current Rouge Hydrabase lipsticks, which have been slowly disappearing from Chanel.com.
Here’s a link to an article about the new line.