It is next year. I believe they are on a two-year cycle at this point.
From a quick search, I don't think the details have been finalized yet but according to Wikipedia there has been a offer for it to be held in Los Angeles in October 2016: https://en.wikipedia.org/wiki/World_Chess_Championship_2016
I don't follow all the tournaments but I've been watching the World Championship for the last 3 years, i think it usually starts in sept and goes into oct. Is it not happening this year because of the World Cup tournament? Just wondering when Magnus will defend the title. Thanks in advance for any help.