Two new album listings have hit Amazon.com and, if the date proves true, both indicate that the Achtung Baby / Zooropa remasters will be released on November 8, 2011. There's one listing that just says Achtung Baby and another that says Achtung Baby: (Deluxe edition). Both listings are sparse-- no images and no details other than the November 8 date. Both also say "1 CD," but we can probably assume that won't be the case on the Deluxe Edition.
Of course, all of this is subject to change.