I emailed LEGO and this is the response

Dear LEGO fan,

Thanks for getting in touch with us and for your interest in LEGO® products.
It's great to hear from you!
Although set 6860 - The Batcave is not available at the moment, it will be showing up on toy store shelves and on LEGO Shop at Home very soon! We hope that it will be available within the next couple weeks. 

Not exactly a perfect answer, but good enough.

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