According to Amazon Germany a Mellon Collie boxset (likely the reissue) is scheduled to come out on December 3rd 2012 with a total of 6 discs! The price is an astonishing 191.99 euros.
Thanks to Phil for the heads up!
UPDATE: Billy told a fan yesterday that he had seen the artwork/package and was blown away. Also that there will be full songs from Pastichio Medley.
UPDATE 2: Amazon USA sets the reissue release to be
November 20th. December 4th.