Here is what it says on the website:
The Masters Qualifier will begin on Thursday, April 23. The world’s top 200 masters athletes in each age division in the Open will be automatically entered into the Masters Qualifier. Like last year, the qualifier will be a four-day online competition. The workouts will be released at 5 p.m. PT on Thursday, April 23, and the competitors will have until 5 p.m. PT on Monday, April 27, to submit their scores. The top 20 athletes in each age division at the end of the qualifier will be invited to compete in the Masters Competition at the CrossFit Games.
The Masters Qualifier
April 23-27, 2015