Every years Kishimoto sau that Naruto is ending XD
Anyway yes, surely it is close to the end, but this will happen very likely just at the end of the next year or maybe in the beginning of 2015.
About Sasuke becoming Hokage, the reasons for it are really logical following the last developments (and overal imagining that the Author would have already clear the truth behind the death of the Uchiha, just like various hints seem to say). Said this, he will not become Hokage in the end
Yes, Kishimoto hinted that Naruto could end next year: he isn't sure, but considering that I'm not sure if he will be able to tell completely all the story (and that already in the past he made wrong predictions), I think that it's not impossible an end of the manga in the first months of the 2015.
Anyway yes, surely it is close to the end, but this will happen very likely just at the end of the next year or maybe in the beginning of 2015.