Welcome to the madness!
First let me say that I only kind of, sort of trust info I get from CM's about the D&B bags. I've been given information that I knew was incorrect too many times.
That said, I was told by a CM that the balloon collection is replacing the Wonder collection as it is being retired. Whether that's true or not, I have no idea.
They had a few bags from the Wonder collection in the shop on the cruise line recently. But I haven't seen much from that collection at DLR for quite awhile. So it doesn't surprise me that your friend hasn't seen them at WDW either.