According to CDJapan, Christina Aguilera will be releasing a new album on Greatest Hits on November 12, 2008.
Below are the description:
Greatest hits album release from Christina Aguilera featuring new songs “Keep Getting Better,” “Dynamite,” and more. Limited Edition includes bonus DVD with music videos and more (subject to change.) *Unless otherwise indicated, DVDs are region-2 encoded (Japan, Europe, and Middle East), and carry no subtitles.
Bonus Track: Japan edition bonus track(s) (expected)”
The release date for Japan is 12.11.08Album will be 2 formats : CD and CD+DVD