Open Ladder and Champion Ladder are always synchronized on all platforms. Season 13 ends tomorrow, Season 14 starts immediatly after and last 5 weeks.
There will be an official announcement tomorrow but you can already find some info in the World Cup announcement:
PS4 & Xbox One
The winners of the Champion Cups 14 and 15 will be qualified for the World Cup 2018 Play-Offs!
Champion Ladder Season 14 starts April 4th on PC/Mac, PS4 and Xbox One at 12:00pm (CEST) and finishes May 9th at 11:59am (CEST).
Champion Ladder Season 15 starts May 9th on PC/Mac, PS4 and Xbox One at 12:00pm (CEST) and finishes June 13th at 11:59am (CEST).