Every iteration includes updates to hardware, mechanical design, and software. We will be contacting each customer to confirm their shipping address, which modem and power supply they would like, and to confirm which shipping batch they are currently scheduled to receive — and to give them an opportunity to select a later batch than they are scheduled for, should they prefer to wait for a later iteration. As slots in a particular early batch free up, we will open it up for others in a later batch to join in, according to the date of the order.