The U.S. State Department released aggregate New START numbers from the 1 September 2015 data exchange. Russia declared 1648 deployed warheads, 526 deployed launchers, and 877 total launchers. In March 2015 the numbers were 1582, 515, and 890 respectively.
The increase of 66 deployed warheads and nine launchers is most likely due to the deployment of Bulava missiles on the Alexander Nevskiy submarine that was completed in April 2015. Also, some older missiles were probably withdrawn from service.
The U.S. numbers in September 2015 were 1538 warheads, 762 deployed and 898 total launchers (1597, 785, and 898 in March 2015).