QuoteAt the end of the third quarter of 2015, Amazon was using 30,000 Kiva robots across 13 warehouses. Each Kiva-equipped warehouse can hold 50% more inventory per square foot than centers without robots. In turn, the company's operating costs have been sliced by 20%—or almost $22 million—per warehouse.

http://qz.com/709541/amazon-is-just-beginning-to-use-robots-in-its-warehouses-and-theyre-already-making-a-huge-difference/

Interesting. From 2011:

http://www.logisticsonline.com/doc/kompletts-showpiece-distribution-center-for-i-0001

I actually thought Amazon was already further along than this.

With all the press they've gotten over the working conditions in their warehouses, I thought they were pushing to get rid of human works ASAP. I guess this is ASAP - it must be some endeavor to scale at that level