On Sunday, May 1, some MagicBand+ (MagicBands+, MagicBand+’?) were sold by mistake at World of Disney. They were not supposed to be put on store shelves. The new features do not yet work. If you purchased one, you can return it for a full refund. I guess you can also hold on to it, since it sounds like they will be available for purchase soon.
Remember, MagicBand+ is not replacing MagicBands. They will have some cool new interactive features, but you will still be able to use the ones that you already have.