Mike, WA6ISP, is shipping the first of his new Ubit RaduinoUMax Raduino replacements today.
Mike says he has been working like a beaver since the PCBs arrived.
The MAX is for the 16 Added I/O pins on the end of the PCB. It makes the PCB a little longer, but still fits into uBitx Radio PCB. I2C control gives you 16 more 5V digital I/O ports and uses an Adafruit Library for simple control. Three I2C address jumpers are provided so you can use other I2C modules.