The first test launch of the Bulava SLBM in 2014 will be conducted from the Yuri Dolgorikiy submarine, not from Vladimir Monomakh, as it was planned earlier.

It's probably a stretch, but it may be that the change is related to some lingering doubts about Bulava - in the original plan the launch was supposed to be part of Vladimir Monomakh state trials, rather than a test of the missile. Switching to Yury Dolgorukiy is a way to test the missile, not a submarine.

UPDATE 09/09/2014: Reports say it's Vladimir Monomakh after all.