The only update I can find online is regarding a UK reissue to theatres, and the news there is not good. The UK fans want that song back as much as we do, but apparently Disney don't care...
http://www.denofgeek.com/movies/the-muppet-christmas-carol/22320/updated-the-muppet-christmas-carol-cinematic-re-release
This doesn't augur well for the Blu Ray release. You would imagine that the film will be screened digitally, and one would imagine that would be the most recent master, which would have been made for the Blu Ray...
http://www.denofgeek.com/movies/the-muppet-christmas-carol/22320/updated-the-muppet-christmas-carol-cinematic-re-release
This doesn't augur well for the Blu Ray release. You would imagine that the film will be screened digitally, and one would imagine that would be the most recent master, which would have been made for the Blu Ray...