Quoted from "Dmitry"
In World Cup 2015 will play two best-ranked teams from each continent, host and the 2014 World Champion. Continental confederations could organise addictional qualification tournament to World Cup, but in 2015 it's impossible. It'll too many matches & competitions So, the FIVB ranking after 2014 will be very important.
Probably rankings will be after World League-2015 and Grand Prix-2015 in july... Strange system
If European Championship will be from 26/09/2015 to 04/10/2015 and World Cup will be from 22/08/2015 to 06/09/2015... What will be the qualification for the World Cup in Europe? For men is the same question.