All Early Bird units have arrived at Crowd Supply's warehouse, and they are expected to be distributed by the end of this month.
After the Early Bird orders are shipped, we will still have a few units left over. Depending on when your order was placed, some of you who placed a regular order early might get your units fulfilled (or partially fulfilled) ahead of schedule.
More good news: our contract manufacturer in China expects no major roadblocks for the rest of the order.
The reason the hex screw is included is to fix the design flaw of the original Arduino form factor, as one of the mounting holes is too close to the connector. We suggest that you use the hex screw for mounting hole next to the USB connector.