I've never been to one, but I'm really looking forward to my first this year!!
From what I saw on the WDWinfo.com site, there is a
Youtube video, someone narrarates the birth of Christ, and there is a LARGE chorus behind the narrarator and they sing the about His birth.
It looks soooooooooo beautiful. I think I"m going to be a crying mess that day.
And the best thing with the package is you get VIP seating tix after you eat (kind of like the Fantasmic package, which was AWE-SOME-O!!!!).