According to questions asked to the Hasbro representatives at CIII by Adam Pawlus at GalacticHunter.com :
9. Will Hasbro be rereleasing more Unleashed figures like Boba Fett, Han Solo, or Yoda?
A. We're doing a new Han Solo in a Stormtrooper outfit, and there's a new Yoda fighting the Emperor. There are no plans for a new Boba Fett at this time.
10. Will Unleashed continue in 2006?
A. Yes, and no. (Hasbro's team would not elaborate on this answer.)
Seems like Hasbro did not get the "RE-release" part of the question. With prices on e-bay going crazy for figures like Boba Fett, it would be nice to see them again.
Maybe the answer to the 2006 question will be re-releases only