NPR's Planet Money podcast did a story two months ago with the inventor of the self checkout machine, Howard Schneider.
At the end of the end of the episode he was asked what his "dream" supermarket would be, and he said one where people don't have to check items out. They walk in, grab something, walk out, and are automatically charged.
This seems to be exactly what Amazon has done. Pretty amazing to see the realization of his dream be announced only two months after his interview.