They've actually been doing this for a while now, Jake - even our Anglican church has stopped offering the goblet for fear of Swine Flu. You'd think they'd have more faith that their Lord would protect them, wouldn't you - especially in those circumstances.
It comes from the Last Supper when Jesus broke bread and said 'This is my body', and of the wine, 'this is my blood', and told his disciples to do this in remembrance of him. I've always thought he meant them to gather around a table and have supper together whilst remembering him, rather than actually eat and drink his body.
I am a Catholic Jake and I just believe that the body and blood represent what Christ did for us. I think I am supposed to believe that it changes but I don't.