Based on newest arduino zero board with powerfull mcu.
Native 3.3V, many sensors, modules and SD cards are working on this voltage level
I want small board :
=> fun without shields
=> I2C header
=> micro sd reader
= WINXI (because predecessor have small wings)
-optionall micro SD Card reader (not supported in arduino IDE now)
-touch button pad (on bottom of board)
-metalic Usb-A support
-in next version vertical Usb for usb host
-I think really nice shape :)
-Atsamd21E18 (TQFP32 > same size as atmega328), more soldering fiendly than Atsamd21G18 (LQFP48)
-no EDBG chip, programming via native usb only
-Smart pinout !!!! Direct IIC/ TWI sensors most used combination vcc/gnd/scl/sda
Powered from usb, it is great, you can use any your phone charger, powerbank etc...
No jtag programmer required, board have integrated USB bootloader
Adafruit intensive working on port micropython to SamD21. I have tested it and it is amazing ! Everything seems working REPL, Mass storage ....unfortunately I have no idea about Pyhon, but It is time to start learning.