The Spanish Promusic website, which is the alliance between all the major record labels, has released a preliminary calendar of 2008 music releases, including a rerelease of Blackout, pencilled in for release on June 17th.
Here is my translation from Spanish:
“Special edition of Britney’s latest critically acclaimed album “Blackout”. Includes the original album plus 4 new tracks, remixes and a DVD about the production of the most risky project in Britney’s career make up this collectors boxset. June 17th 2008.”
Source: Britney Spy/Break The Ice