Enterprise was shot in HD so it won't take much to have that out on BD. DS9 needs the same treatment as TNG but more original negatives are likely to exist since it is a newer series. DS9 ended in 1999, which was still before HD, so expect 4:3 aspect ratio. Same process -- shot on 35mm, effects done in 24 frames 480i, distribution subs recorded to video tape.
I haven't sprung for TNG season 1 yet. I want to let all those sets with bad audio work their way out of the retail chain.
HD-DVD = 94
Blu-Ray = 120 ( 24 Warner red2blu )