Yup, they announced that they intend to stay to 2018. Whether they do is up to them. They've won everything they possibly could, including not one but two OGs on home soil in front of ecstatic crowds. If they leave, there will be a lack of star power in the field for the moment, but no lack of talent in the deep Russian pairs reserves.
I was going to post something about them but feel it is better I not.
I like K/S's programs though.