Ok so if you pull the bottom off of the Mini, you can get access to a button which if you hold while powering up will supply a USB device through the Player2 port. Don't use the USB Type-C cable you get with the Mini for anything other than power as it has no data lines.
I've been trying to communicate with the USB device, as it responds to USB Mass Storage-like commands. I've also been disassembling multiple versions of the firmware writing tool provided by Actions (who supply the chip), but none of the commands the device will respond to other than the identification commands, and some of the commands need some kind of a certificate.
There's also a UART port on the board, which I've hooked up to my console, and you can get plenty of nice information from the Mini as you boot it up, and then you get a linux login prompt. None of the common user/pass logins work for me.
Anyone else poking around their Mini got any good info?