Big Brain release date?

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Everywhere, I read that the release date of Big Brain Academy for Wii is today, June 12.

But all of a sudden, Amazon.com says it's in stock on June 26, and pretty much every other retailer says it's backordered. I had pre-ordered through Amazon a while ago so I'm quite sure I would've been in their initial shipments.

What's the deal, was the release delayed or will stores have it today?