It's deja vue all over again. We went through this with DVD-Rs. The STUDIOS suffer from acute paranoia and after a short grace period (because they were having trouble getting their movies to play) have now pressured manufacturers to remove the ability of BluRay players to play BD-R disks. Duplicators have decided to hang back, as the investment is huge and the return has yet to become apparent. Therefore, even if you can author and burn a beautiful BluRay disk, how are you going to play it? Oh yes, there is the Sony PS3. One firmware upgrade removed the ability to play BD-R disks. Oddly, that ability has been restored with another firmware upgrade, but for how long? So there is no real reason for Apple to rush BluRay support into DVD Studio Pro. Actually, it makes more sense for Apple to wait till this shakes out a bit, then come out with a really killer product that will allow you to author beautiful BluRay DVDs that can actually be played.
By the way, I have used Adobe Encore and Premiere. I find them very inferior to Final Cut and DVD StudioPro. The only thing they offer is BluRay now.