I believe CPR send emails to the pre-order list in waves. They allow 14 days to complete the purchase before your position is considered abandoned.

My pre-order was acknowledged on 3/3/16. I got my email Friday 4/13 (10 days ago).

Based on the 14 days to complete purchase I believe the next wave should go out at the end of this week. The second wave may still be for those who were acknowledged on the same day as me (3/3/16). CPR work in order of pre-order email received.

I don't know if CPR send emails out to the next people on the list if those in the first wave claim their pre-order. I would doubt it. They're a small shop. They probably just work in 14 day chunks. Pack your patience!