The date and time has not been announced yet, but will most likely open mid to late May 2017 and will coincide with Blizzcon ticket sales.
The order form will remain open, and slots will be chosen via lottery. I will choose 5 slots at a time, and continue to do batches until I am no longer able to due to time constraints.
Patreon subscribers will have early access and guaranteed badge slots, plus discounts for specific tiers.