This is the fine print that was in the pre-order sign up email.
It looks like the next box is august....
You must be an Allure Beauty Enthusiast and a legal resident of one of the 50 United States or the District of Columbia and at least 18 years of age as of the date of submission. Complete and submit the Allure Beauty Box purchase form as directed starting April 15, 2014 at 12:01 PM EST to receive one (1) May, one (1) August, and one (1) December 2014 Beauty Box (ARV $750). Transaction must be completed by April 22, 2014 at 11:59 PM EST. Unique code good for one use only. Please allow six to eight weeks for delivery once the box is made available for purchase to the public. Sponsor is not responsible for errors in the administration or fulfillment of this promotion, including but not limited to human and technical errors.