It seems to be a rumor.Amazon has millions of users world wide and many would be happy if it accepts bitcoin.It is expected that on october 26th,the announcement may come during amazon's next earning conference call.
Expedia,TigerDirect,Microsoft's store,Overstock now accept bitcoins.Amazon may take such a step of accepting bitcoins to compete with overstock as they would not like any of the customers to switch to overstock for the reason of bitcoin payment.