Just a quick update - the contract manufacturer put the chips onto the 6 layer boards... and I've been soldering the rest of the parts. The boards look awesome! Robin and I keep having a "double take" when we glance at them. They kind of look like a Teensy 3.2 from a distance, but then you notice it's different. The arrangement of parts on the top side isn't changed much from the center region of the first beta, but still, seeing it now actually in the Teensy form factor looks awesome.
It's only been a few months since I brought up the first round of beta boards, but it kinda feels like a lifetime ago. And ~2090 messages ago! At first I had a terrible sinking feeling, when the first 2 boards weren't working at all. A few hours into troubleshooting, I found my saved notes about the test procedure, which involves the important first step of setting a couple of the OTP fuses. With all this focus on Arduino stuff, and then on the PCB layout, I'd mostly forgotten that process which is based on stuff from my earliest experiments with the chip (long before the bootloader).
Great news! I am very curious what they look like.
On the whole, the software already works, and the beta boards are easy to use - even if there are still some small things missing in the software. The home straight is in sight!
Do you already know more about the expected price? I know you've written about it before, but I can't find it.