Anyone using these? Are the new features compatible with Arduino?
Yep, there is a post already about this chip, just no replies yet. New micro from Atmega328's family - #2 by codlink - Suggestions for the Arduino Project - Arduino Forum
Significant discussion here: ATmega328PB with Arduino - Microcontrollers - Arduino Forum
It's not clear how it would fit into the arduino framework. There's no place to put the 4 extra pins worth of function on the usual board-level arduinos.
Arduino sketches run fine on the Atmel atmega328pb Xplained Mini eval board.
Sorry for the delayed response. Thank you very much folks, I will follow those posts.