Sadly, it probably means delays. Not necessarily on THC's part either. On a number of occasions I've pre-ordered movies on Amazon, only to receive them up to a month AFTER the release date, even though they became available on that date in stores.

Maybe Amazon is just as unreliable with other products?

No doubt they expected it to be available, so they told the artist to include it in promos. I can't believe nobody asked about in on the FB page yet.