Any one know when it's out?
DS9 (along with TNG and Voyager) would be impossible to release on Blu-Ray without massive alterations. The effects and editing were all done on videotape, whose maximum resolution is so low that it would make a BR release impossible.
To release those three shows on BR, all of the effects would have to be done over again, from scratch. Just like they did with TOS. And since there are seven seasons, of three shows each, that they would have to do, I don't ever imagine this would happen, since it would take too long and be way too expensive.
As far as I know, Enterprise
is the only Trek show that is airable in HD from the get-go. They could release ENT in Blu-Ray right now.