I just did a full research for new Michael Jackson releases (no re-releases), but did not find more then this two below:
Title: King of Pop - French Edition
Format: 2 CD / 3 CD
Release Date: December 16, 2008.
Label: Sony BMG Music Entertainment
Title: The Collection of the King of Pop, Michael Jackson
Format: Box Set (6 books)
Release Date: December 12, 2008.
Label: Julien's Auctions
Most probably we will have surprises next year just in 2008. Remember the "Thriller 25" album, the new singles and the "King of Pop" project. These releases generated huge media and public attention, incredible sales for Jackson fully supported by his fans, the music lowers and his previous record labels.