At 18:13 MSK (15:13 UTC) on August 22, 2015 the Strategic Rocket Forces carried out a successful launch of a Topol/SS-25 missile that was used to test "new combat payload for future ICBMs." The missile payload reported to have successfully reached its target at the Sary Shagan test site in Kazakhstan.
Although the official reports refer to the missile as Topol, it is
most likely the Topol-E modification of the missile, which is used to
rest experimental warheads in launches from Kapustin Yar to Sary-Shagan.
Two launches of this kind took place in 2014, the last one -- in May 20, 2014. In fact, the Rocket Forces planned to conduct three launches that year, but didn't.
It's possible that today's launch is the one that was moved from the 2014 schedule.
UPDATE 08/23/15: It appears that I missed one Topol launch from Kapustin Yar in 2014 - in an overview of the life extension programs Sergey Karakayev, the commander of the Rocket Forces, says that there were three Topol launches. Jonathan McDowell's list of suborbital launches has a Topol launch from Kapustin Yar on 11 November 2014. There was nothing in the news, however.