According to Newtype magazine March issue, an anime movie of "Higashi no Eden" was announced to be shown in 2009 as a sequel to the TV series.

Staff
Director & Script: Kamiyama Kenji
Character Designer: Morikawa Satoko ("The Cat Returns")
Graphic Art Director: Nakamura Satoru ("Toshokan Sensou")
Music: Kawai Kenji
Production Studio: Production I.G

Related News: Kamiyama Kenji's New Anime Higashi no Eden Announced [Updated on Nov 28]
Source: MOONPHASE
Higashi no Eden Official Website

Updated
According to the announcement aired at the end of the final episode of the TV series, the movie of Higashi no Eden is composed of two parts and will be premiered on November 28th. The subtitles of the two parts are:
Movie I: The King of Eden (Nov 28, 2009)
Movie II: Paradise Lost (Jan 2010)

Sources:
Screenshot of the announcement
official blog