The book in question, California, was written by Edan Lepucki and is due to be published by the Hachette imprint Little, Brown on 8 July. Unfortunately, due to the ongoing contract dispute between Amazon and Hachette, there's no way for Amazon customers to pre-order the book which Amazon is recommending.
Amazon stopped taking pre-orders on Hachette titles a little over a month ago as a way of pressuring Hachette into accepting a new contract. No one knows for sure what the two are fighting over, but the numerous leaks from Hachette suggest that Amazon wants increased co-op fees, and possibly better terms on ebook sales.
But none of that matters today; what's important is that Amazon is recommending a book which you can't order. This is the online equivalent of a retail chain promoting a product in their weekly circular while also forgetting to have the product in stock.
While that is amusing, I see it as a sign of Amazon's willingness to play hardball. They'll even sacrifice sales of a hot new title which Amazon's own booksellers think is a great read. If I were one of the major publishers I wouldn't be giggling; I would be afraid. I'd be very afraid.