They are going to posting the steps in the chat room, hourly.
Usually what happens is there is a beginning time ... of course, we all have the first step with fabrics all cut.
All fabrics cut, the howdy on July 12 at whatever time, and then the fun begins ... they tell you each step, one at a time, in the meantime, if you finish each step, we sit in chat and just do what you do in chat while waiting to see which of us wins the door prizes, and then the next step and so on throughout the day.
I saw a place that said they would be leaving the total mystery up online for twenty four hours following the closing stitches, so you could download the entire pattern at that time ... or see it to see if it really is something you want to do ...
I have done a number of mystery quilts, and I have observed online workdays like during the football playoffs, etc.
It can be a lot of fun, but, I am glad I missed the New Year's Eve quilt ... curves are not my idea of practical or fun (but, then ... what do I know? My eyes are brown! LOL)